diff --git a/src/musredit/PAdmin.cpp b/src/musredit/PAdmin.cpp
index d4368c2c..2ab1e9b2 100644
--- a/src/musredit/PAdmin.cpp
+++ b/src/musredit/PAdmin.cpp
@@ -87,6 +87,8 @@ bool PAdminXMLParser::startElement( const QString&, const QString&,
     fKeyWord = eTitleFromDataFile;
   } else if (qName == "musrview_show_fourier") {
     fKeyWord = eMusrviewShowFourier;
+  } else if (qName == "musrview_show_avg") {
+    fKeyWord = eMusrviewShowAvg;
   } else if (qName == "enable_musrt0") {
     fKeyWord = eEnableMusrT0;
   } else if (qName == "keep_minuit2_output") {
@@ -251,6 +253,13 @@ bool PAdminXMLParser::characters(const QString& str)
         flag = false;
       fAdmin->setMusrviewShowFourierFlag(flag);
       break;
+    case eMusrviewShowAvg:
+      if (str == "y")
+        flag = true;
+      else
+        flag = false;
+      fAdmin->setMusrviewShowAvgFlag(flag);
+    break;
     case eEnableMusrT0:
       if (str == "y")
         flag = true;
@@ -614,6 +623,7 @@ PAdmin::PAdmin() : QObject()
   fFileFormat = QString("");
 
   fMusrviewShowFourier = false;
+  fMusrviewShowAvg = false;
 
   fTitleFromDataFile  = false;
   fEnableMusrT0       = false;
@@ -837,6 +847,12 @@ int PAdmin::savePrefs(QString pref_fln)
         else
           data[i] = "    <musrview_show_fourier>n</musrview_show_fourier>";
       }
+      if (data[i].contains("<musrview_show_avg>") && data[i].contains("</musrview_show_avg>")) {
+        if (fMusrviewShowAvg)
+          data[i] = "    <musrview_show_avg>y</musrview_show_avg>";
+        else
+          data[i] = "    <musrview_show_avg>n</musrview_show_avg>";
+      }
       if (data[i].contains("<enable_musrt0>") && data[i].contains("</enable_musrt0>")) {
         if (fEnableMusrT0)
           data[i] = "    <enable_musrt0>y</enable_musrt0>";
diff --git a/src/musredit/PAdmin.h b/src/musredit/PAdmin.h
index 861dde15..2d0dc51d 100644
--- a/src/musredit/PAdmin.h
+++ b/src/musredit/PAdmin.h
@@ -69,7 +69,8 @@ class PAdminXMLParser : public QXmlDefaultHandler
 
   private:
     enum EAdminKeyWords {eEmpty, eTimeout, eKeepMinuit2Output, eDumpAscii, eDumpRoot,
-                         eTitleFromDataFile, eChisqPreRunBlock, eEstimateN0, eMusrviewShowFourier, eEnableMusrT0,
+                         eTitleFromDataFile, eChisqPreRunBlock, eEstimateN0,
+                         eMusrviewShowFourier, eMusrviewShowAvg, eEnableMusrT0,
                          eFontName, eFontSize, eExecPath, eDefaultSavePath,
                          eRecentFile, eBeamline, eInstitute, eFileFormat, eLifetimeCorrection, eMsrDefaultFilePath,
                          eTheoFuncPixmapPath, eFunc, eFuncName, eFuncComment, eFuncLabel,
@@ -119,6 +120,7 @@ class PAdmin : public QObject
     QString getDefaultSavePath() { return fDefaultSavePath; }
     bool    getTitleFromDataFileFlag() { return fTitleFromDataFile; }
     bool    getMusrviewShowFourierFlag() { return fMusrviewShowFourier; }
+    bool    getMusrviewShowAvgFlag() { return fMusrviewShowAvg; }
     bool    getEnableMusrT0Flag() { return fEnableMusrT0; }
     bool    getKeepMinuit2OutputFlag() { return fKeepMinuit2Output; }
     bool    getDumpAsciiFlag() { return fDumpAscii; }
@@ -142,6 +144,7 @@ class PAdmin : public QObject
     void setTimeout(const int ival) { fTimeout = ival; }
     void setTitleFromDataFileFlag(const bool flag) { fTitleFromDataFile = flag; }
     void setMusrviewShowFourierFlag(const bool flag) { fMusrviewShowFourier = flag; }
+    void setMusrviewShowAvgFlag(const bool flag) { fMusrviewShowAvg = flag; }
     void setEnableMusrT0Flag(const bool flag) { fEnableMusrT0 = flag; }
     void setKeepMinuit2OutputFlag(const bool flag) { fKeepMinuit2Output = flag; }
     void setDumpAsciiFlag(const bool flag) { fDumpAscii = flag; }
@@ -185,6 +188,7 @@ class PAdmin : public QObject
     QVector<QString> fRecentFile; ///< keep vector of recent path-file names
 
     bool fMusrviewShowFourier; ///< flag indicating if musrview should show at startup data (=false) or Fourier of data (=true).
+    bool fMusrviewShowAvg;     ///< flag indicating if musrview should show at startup averaged (=true) or original (=false) data/Fourier.
     bool fKeepMinuit2Output;   ///< flag indicating if the Minuit2 output shall be kept (default: no)
     bool fDumpAscii;           ///< flag indicating if musrfit shall make an ascii-dump file (for debugging purposes, default: no).
     bool fDumpRoot;            ///< flag indicating if musrfit shall make an root-dump file (for debugging purposes, default: no).
diff --git a/src/musredit/PPrefsDialog.cpp b/src/musredit/PPrefsDialog.cpp
index c876a12f..1b40a423 100644
--- a/src/musredit/PPrefsDialog.cpp
+++ b/src/musredit/PPrefsDialog.cpp
@@ -62,6 +62,7 @@ PPrefsDialog::PPrefsDialog(PAdmin *admin) : fAdmin(admin)
   fPerRunBlockChisq_checkBox->setChecked(fAdmin->getChisqPerRunBlockFlag());
   fEstimateN0_checkBox->setChecked(fAdmin->getEstimateN0Flag());
   fFourier_checkBox->setChecked(fAdmin->getMusrviewShowFourierFlag());
+  fAvg_checkBox->setChecked(fAdmin->getMusrviewShowAvgFlag());
 
   fTimeout_lineEdit->setText(QString("%1").arg(fAdmin->getTimeout()));
   fTimeout_lineEdit->setValidator(new QIntValidator(fTimeout_lineEdit));
diff --git a/src/musredit/PPrefsDialog.h b/src/musredit/PPrefsDialog.h
index 7543c0a8..edba329f 100644
--- a/src/musredit/PPrefsDialog.h
+++ b/src/musredit/PPrefsDialog.h
@@ -47,6 +47,7 @@ class PPrefsDialog : public QDialog, private Ui::PPrefsDialog
     PPrefsDialog(PAdmin *admin);
 
     bool getMusrviewShowFourierFlag() { return fFourier_checkBox->isChecked(); }
+    bool getMusrviewShowAvgFlag()   { return fAvg_checkBox->isChecked(); }
     bool getKeepMinuit2OutputFlag() { return fKeepMn2Output_checkBox->isChecked(); }
     bool getTitleFromDataFileFlag() { return fTitleFromData_checkBox->isChecked(); }
     bool getEnableMusrT0Flag()      { return fEnableMusrT0_checkBox->isChecked(); }
diff --git a/src/musredit/PTextEdit.cpp b/src/musredit/PTextEdit.cpp
index 5774fa8b..6bf78ca2 100644
--- a/src/musredit/PTextEdit.cpp
+++ b/src/musredit/PTextEdit.cpp
@@ -1699,6 +1699,12 @@ void PTextEdit::musrCalcChisq()
   if ( !currentEditor() )
     return;
 
+  int result = 0;
+  if (fAdmin->getEstimateN0Flag())
+    result = QMessageBox::question(this, "Estimate N0 active",
+                           "Do you wish a chisq/mlh evaluation with an automatic N0 estimate?",
+                           QMessageBox::Yes, QMessageBox::No);
+
   QString tabLabel = fTabWidget->tabText(fTabWidget->currentIndex());
   if (tabLabel == "noname") {
     QMessageBox::critical(this, "**ERROR**", "For a fit a real msr-file is needed.");
@@ -1716,8 +1722,8 @@ void PTextEdit::musrCalcChisq()
   cmd.append(str);
   cmd.append(QFileInfo(*fFilenames.find( currentEditor())).fileName() );
   cmd.append("--chisq-only");
-  cmd.append("--estimateN0");
-  cmd.append("no");
+  if (fAdmin->getEstimateN0Flag() && (result == QMessageBox::Yes))
+    cmd.append("--estimateN0");
   PFitOutputHandler fitOutputHandler(QFileInfo(*fFilenames.find( currentEditor() )).absolutePath(), cmd);
   fitOutputHandler.setModal(true);
   fitOutputHandler.exec();
@@ -1770,19 +1776,11 @@ void PTextEdit::musrFit()
   // check estimate N0 flag
   if (fAdmin->getEstimateN0Flag()) {
     cmd.append("--estimateN0");
-    cmd.append("yes");
-  } else {
-    cmd.append("--estimateN0");
-    cmd.append("no");
   }
 
   // check per-run-block-chisq flag
   if (fAdmin->getChisqPerRunBlockFlag()) {
     cmd.append("--per-run-block-chisq");
-    cmd.append("yes");
-  } else {
-    cmd.append("--per-run-block-chisq");
-    cmd.append("no");
   }
 
   // add timeout
@@ -2203,6 +2201,8 @@ void PTextEdit::musrView()
   cmd += str + "\" --timeout " + numStr;
   if (fAdmin->getMusrviewShowFourierFlag())
     cmd += " -f ";
+  if (fAdmin->getMusrviewShowAvgFlag())
+    cmd += " -a ";
   cmd += " &";
 
   int status=system(cmd.toLatin1());
diff --git a/src/musredit/forms/PPrefsDialog.ui b/src/musredit/forms/PPrefsDialog.ui
index 90f3e0b9..0bfc0f51 100644
--- a/src/musredit/forms/PPrefsDialog.ui
+++ b/src/musredit/forms/PPrefsDialog.ui
@@ -33,7 +33,7 @@
     <item>
      <widget class="QTabWidget" name="fTabWidget">
       <property name="currentIndex">
-       <number>0</number>
+       <number>2</number>
       </property>
       <widget class="QWidget" name="fGeneral_tab">
        <attribute name="title">
@@ -175,6 +175,19 @@
          <string>start with Fourier</string>
         </property>
        </widget>
+       <widget class="QCheckBox" name="fAvg_checkBox">
+        <property name="geometry">
+         <rect>
+          <x>10</x>
+          <y>40</y>
+          <width>261</width>
+          <height>22</height>
+         </rect>
+        </property>
+        <property name="text">
+         <string>start with averaged data/Fourier</string>
+        </property>
+       </widget>
       </widget>
       <widget class="QWidget" name="fMusrt0_tab">
        <attribute name="title">
diff --git a/src/musredit_qt5/PAdmin.cpp b/src/musredit_qt5/PAdmin.cpp
index 2f6b1bc4..4a1f2fa1 100644
--- a/src/musredit_qt5/PAdmin.cpp
+++ b/src/musredit_qt5/PAdmin.cpp
@@ -37,6 +37,8 @@ using namespace std;
 #include <QTextStream>
 #include <QVector>
 
+#include <QProcessEnvironment>
+
 #include "PAdmin.h"
 
 //--------------------------------------------------------------------------
@@ -87,6 +89,8 @@ bool PAdminXMLParser::startElement( const QString&, const QString&,
     fKeyWord = eTitleFromDataFile;
   } else if (qName == "musrview_show_fourier") {
     fKeyWord = eMusrviewShowFourier;
+  } else if (qName == "musrview_show_avg") {
+    fKeyWord = eMusrviewShowAvg;
   } else if (qName == "enable_musrt0") {
     fKeyWord = eEnableMusrT0;
   } else if (qName == "keep_minuit2_output") {
@@ -234,7 +238,7 @@ bool PAdminXMLParser::characters(const QString& str)
     case eExecPath:
       fAdmin->setExecPath(QString(str.toLatin1()).trimmed());
       break;
-    case eDefaultSavePath:
+    case eDefaultSavePath:      
       fAdmin->setDefaultSavePath(QString(str.toLatin1()).trimmed());
       break;
     case eTitleFromDataFile:
@@ -251,6 +255,13 @@ bool PAdminXMLParser::characters(const QString& str)
         flag = false;
       fAdmin->setMusrviewShowFourierFlag(flag);
       break;
+    case eMusrviewShowAvg:
+      if (str == "y")
+        flag = true;
+      else
+        flag = false;
+      fAdmin->setMusrviewShowAvgFlag(flag);
+      break;
     case eEnableMusrT0:
       if (str == "y")
         flag = true;
@@ -477,7 +488,7 @@ bool PAdminXMLParser::endDocument()
     str = expandPath(fAdmin->getDefaultSavePath());
     if (!str.isEmpty())
       fAdmin->setDefaultSavePath(str);
-  }
+ }
 
   if (fAdmin->getMsrDefaultFilePath().indexOf('$') >= 0) {
     str = expandPath(fAdmin->getMsrDefaultFilePath());
@@ -567,13 +578,21 @@ QString PAdminXMLParser::expandPath(const QString &str)
   QString msg;
   QString newStr="";
 
+  QProcessEnvironment procEnv = QProcessEnvironment::systemEnvironment();
+
   QStringList list = str.split("/");
 
   for ( QStringList::Iterator it = list.begin(); it != list.end(); ++it ) {
     token = *it;
     if (token.contains("$")) {
       token.remove('$');
-      path = std::getenv(token.toLatin1());
+      if (!procEnv.contains(token)) {
+        msg = QString("Couldn't find '%1'. Some things might not work properly").arg(token);
+        QMessageBox::warning(0, "**WARNING**", msg, QMessageBox::Ok, QMessageBox::NoButton);
+        newStr = "";
+        break;
+      }
+      path = procEnv.value(token, "");
       if (path.isEmpty()) {
         msg = QString("Couldn't expand '%1'. Some things might not work properly").arg(token);
         QMessageBox::warning(0, "**WARNING**", msg, QMessageBox::Ok, QMessageBox::NoButton);
@@ -614,6 +633,7 @@ PAdmin::PAdmin() : QObject()
   fFileFormat = QString("");
 
   fMusrviewShowFourier = false;
+  fMusrviewShowAvg = false;
 
   fTitleFromDataFile  = false;
   fEnableMusrT0       = false;
@@ -646,17 +666,18 @@ PAdmin::PAdmin() : QObject()
   QString path = QString("./");
   QString fln = QString("musredit_startup.xml");
   QString pathFln = path + fln;
+  QProcessEnvironment procEnv = QProcessEnvironment::systemEnvironment();
   if (!QFile::exists(pathFln)) {
     // 2nd: check $HOME/.musrfit/musredit/musredit_startup.xml
-    path = std::getenv("HOME");
+    path = procEnv.value("HOME", "");
     pathFln = path + "/.musrfit/musredit/" + fln;
     if (!QFile::exists(pathFln)) {
       // 3rd: check $MUSRFITPATH/musredit_startup.xml
-      path = std::getenv("MUSRFITPATH");
+      path = procEnv.value("MUSRFITPATH", "");
       pathFln = path + "/" + fln;
       if (!QFile::exists(pathFln)) {
         // 4th: check $ROOTSYS/bin/musredit_startup.xml
-        path = std::getenv("ROOTSYS");
+        path = procEnv.value("ROOTSYS", "");
         pathFln = path + "/bin/" + fln;
       }
     }
@@ -837,12 +858,24 @@ int PAdmin::savePrefs(QString pref_fln)
         else
           data[i] = "    <musrview_show_fourier>n</musrview_show_fourier>";
       }
+      if (data[i].contains("<musrview_show_avg>") && data[i].contains("</musrview_show_avg>")) {
+        if (fMusrviewShowAvg)
+          data[i] = "    <musrview_show_avg>y</musrview_show_avg>";
+        else
+          data[i] = "    <musrview_show_avg>n</musrview_show_avg>";
+      }
       if (data[i].contains("<enable_musrt0>") && data[i].contains("</enable_musrt0>")) {
         if (fEnableMusrT0)
           data[i] = "    <enable_musrt0>y</enable_musrt0>";
         else
           data[i] = "    <enable_musrt0>n</enable_musrt0>";
       }
+      if (data[i].contains("<font_name>") && data[i].contains("</font_name>")) {
+        data[i] = QString("    <font_name>%1</font_name>").arg(fFontName);
+      }
+      if (data[i].contains("<font_size>") && data[i].contains("</font_size>")) {
+        data[i] = QString("    <font_size>%1</font_size>").arg(fFontSize);
+      }
     }
 
     // write prefs
diff --git a/src/musredit_qt5/PAdmin.h b/src/musredit_qt5/PAdmin.h
index ef9abfc3..b966ef78 100644
--- a/src/musredit_qt5/PAdmin.h
+++ b/src/musredit_qt5/PAdmin.h
@@ -69,7 +69,8 @@ class PAdminXMLParser : public QXmlDefaultHandler
 
   private:
     enum EAdminKeyWords {eEmpty, eTimeout, eKeepMinuit2Output, eDumpAscii, eDumpRoot,
-                         eTitleFromDataFile, eChisqPreRunBlock, eEstimateN0, eMusrviewShowFourier, eEnableMusrT0,
+                         eTitleFromDataFile, eChisqPreRunBlock, eEstimateN0,
+                         eMusrviewShowFourier, eMusrviewShowAvg, eEnableMusrT0,
                          eFontName, eFontSize, eExecPath, eDefaultSavePath,
                          eRecentFile, eBeamline, eInstitute, eFileFormat, eLifetimeCorrection, eMsrDefaultFilePath,
                          eTheoFuncPixmapPath, eFunc, eFuncName, eFuncComment, eFuncLabel,
@@ -119,6 +120,7 @@ class PAdmin : public QObject
     QString getDefaultSavePath() { return fDefaultSavePath; }
     bool    getTitleFromDataFileFlag() { return fTitleFromDataFile; }
     bool    getMusrviewShowFourierFlag() { return fMusrviewShowFourier; }
+    bool    getMusrviewShowAvgFlag() { return fMusrviewShowAvg; }
     bool    getEnableMusrT0Flag() { return fEnableMusrT0; }
     bool    getKeepMinuit2OutputFlag() { return fKeepMinuit2Output; }
     bool    getDumpAsciiFlag() { return fDumpAscii; }
@@ -142,6 +144,7 @@ class PAdmin : public QObject
     void setTimeout(const int ival) { fTimeout = ival; }
     void setTitleFromDataFileFlag(const bool flag) { fTitleFromDataFile = flag; }
     void setMusrviewShowFourierFlag(const bool flag) { fMusrviewShowFourier = flag; }
+    void setMusrviewShowAvgFlag(const bool flag) { fMusrviewShowAvg = flag; }
     void setEnableMusrT0Flag(const bool flag) { fEnableMusrT0 = flag; }
     void setKeepMinuit2OutputFlag(const bool flag) { fKeepMinuit2Output = flag; }
     void setDumpAsciiFlag(const bool flag) { fDumpAscii = flag; }
@@ -185,6 +188,7 @@ class PAdmin : public QObject
     QVector<QString> fRecentFile; ///< keep vector of recent path-file names
 
     bool fMusrviewShowFourier; ///< flag indicating if musrview should show at startup data (=false) or Fourier of data (=true).
+    bool fMusrviewShowAvg;     ///< flag indicating if musrview should show at startup averaged (=true) or original (=false) data/Fourier.
     bool fKeepMinuit2Output;   ///< flag indicating if the Minuit2 output shall be kept (default: no)
     bool fDumpAscii;           ///< flag indicating if musrfit shall make an ascii-dump file (for debugging purposes, default: no).
     bool fDumpRoot;            ///< flag indicating if musrfit shall make an root-dump file (for debugging purposes, default: no).
diff --git a/src/musredit_qt5/PPrefsDialog.cpp b/src/musredit_qt5/PPrefsDialog.cpp
index c876a12f..1b40a423 100644
--- a/src/musredit_qt5/PPrefsDialog.cpp
+++ b/src/musredit_qt5/PPrefsDialog.cpp
@@ -62,6 +62,7 @@ PPrefsDialog::PPrefsDialog(PAdmin *admin) : fAdmin(admin)
   fPerRunBlockChisq_checkBox->setChecked(fAdmin->getChisqPerRunBlockFlag());
   fEstimateN0_checkBox->setChecked(fAdmin->getEstimateN0Flag());
   fFourier_checkBox->setChecked(fAdmin->getMusrviewShowFourierFlag());
+  fAvg_checkBox->setChecked(fAdmin->getMusrviewShowAvgFlag());
 
   fTimeout_lineEdit->setText(QString("%1").arg(fAdmin->getTimeout()));
   fTimeout_lineEdit->setValidator(new QIntValidator(fTimeout_lineEdit));
diff --git a/src/musredit_qt5/PPrefsDialog.h b/src/musredit_qt5/PPrefsDialog.h
index 7543c0a8..edba329f 100644
--- a/src/musredit_qt5/PPrefsDialog.h
+++ b/src/musredit_qt5/PPrefsDialog.h
@@ -47,6 +47,7 @@ class PPrefsDialog : public QDialog, private Ui::PPrefsDialog
     PPrefsDialog(PAdmin *admin);
 
     bool getMusrviewShowFourierFlag() { return fFourier_checkBox->isChecked(); }
+    bool getMusrviewShowAvgFlag()   { return fAvg_checkBox->isChecked(); }
     bool getKeepMinuit2OutputFlag() { return fKeepMn2Output_checkBox->isChecked(); }
     bool getTitleFromDataFileFlag() { return fTitleFromData_checkBox->isChecked(); }
     bool getEnableMusrT0Flag()      { return fEnableMusrT0_checkBox->isChecked(); }
diff --git a/src/musredit_qt5/PTextEdit.cpp b/src/musredit_qt5/PTextEdit.cpp
index abf34026..c0285d1d 100644
--- a/src/musredit_qt5/PTextEdit.cpp
+++ b/src/musredit_qt5/PTextEdit.cpp
@@ -848,6 +848,13 @@ void PTextEdit::fileOpen()
 
     ++it;
   }
+
+  // in case there is a 1st empty tab "noname", remove it
+  if (fTabWidget->tabText(0) == "noname") { // has to be the first, otherwise do nothing
+    fFileSystemWatcher->removePath("noname");
+
+    delete fTabWidget->widget(0);
+  }
 }
 
 //----------------------------------------------------------------------------------------------------
@@ -879,6 +886,13 @@ void PTextEdit::fileOpenRecent()
     else
       fileReload();
   }
+
+  // in case there is a 1st empty tab "noname", remove it
+  if (fTabWidget->tabText(0) == "noname") { // has to be the first, otherwise do nothing
+    fFileSystemWatcher->removePath("noname");
+
+    delete fTabWidget->widget(0);
+  }
 }
 
 //----------------------------------------------------------------------------------------------------
@@ -1699,6 +1713,11 @@ void PTextEdit::musrCalcChisq()
   if ( !currentEditor() )
     return;
 
+  int result = 0;
+  if (fAdmin->getEstimateN0Flag())
+    result = QMessageBox::question(this, "Estimate N0 active",
+                           "Do you wish a chisq/mlh evaluation with an automatic N0 estimate?");
+
   QString tabLabel = fTabWidget->tabText(fTabWidget->currentIndex());
   if (tabLabel == "noname") {
     QMessageBox::critical(this, "**ERROR**", "For a fit a real msr-file is needed.");
@@ -1716,8 +1735,8 @@ void PTextEdit::musrCalcChisq()
   cmd.append(str);
   cmd.append(QFileInfo(*fFilenames.find( currentEditor())).fileName() );
   cmd.append("--chisq-only");
-  cmd.append("--estimateN0");
-  cmd.append("no");
+  if (fAdmin->getEstimateN0Flag() && (result == QMessageBox::Yes))
+    cmd.append("--estimateN0");
   PFitOutputHandler fitOutputHandler(QFileInfo(*fFilenames.find( currentEditor() )).absolutePath(), cmd);
   fitOutputHandler.setModal(true);
   fitOutputHandler.exec();
@@ -1770,19 +1789,11 @@ void PTextEdit::musrFit()
   // check estimate N0 flag
   if (fAdmin->getEstimateN0Flag()) {
     cmd.append("--estimateN0");
-    cmd.append("yes");
-  } else {
-    cmd.append("--estimateN0");
-    cmd.append("no");
   }
 
   // check per-run-block-chisq flag
   if (fAdmin->getChisqPerRunBlockFlag()) {
     cmd.append("--per-run-block-chisq");
-    cmd.append("yes");
-  } else {
-    cmd.append("--per-run-block-chisq");
-    cmd.append("no");
   }
 
   // add timeout
@@ -2205,6 +2216,10 @@ void PTextEdit::musrView()
   if (fAdmin->getMusrviewShowFourierFlag())
     arg << "-f";
 
+  // start with averaged data/Fourier?
+  if (fAdmin->getMusrviewShowAvgFlag())
+    arg << "-a";
+
   QProcess *proc = new QProcess(this);
 
   // make sure that the system environment variables are properly set
@@ -2333,6 +2348,7 @@ void PTextEdit::musrPrefs()
 
   if (dlg->exec() == QDialog::Accepted) {
     fAdmin->setMusrviewShowFourierFlag(dlg->getMusrviewShowFourierFlag());
+    fAdmin->setMusrviewShowAvgFlag(dlg->getMusrviewShowAvgFlag());
     fAdmin->setKeepMinuit2OutputFlag(dlg->getKeepMinuit2OutputFlag());
     fAdmin->setTitleFromDataFileFlag(dlg->getTitleFromDataFileFlag());
     fAdmin->setEnableMusrT0Flag(dlg->getEnableMusrT0Flag());
diff --git a/src/musredit_qt5/forms/PPrefsDialog.ui b/src/musredit_qt5/forms/PPrefsDialog.ui
index 90f3e0b9..8f78eaa4 100644
--- a/src/musredit_qt5/forms/PPrefsDialog.ui
+++ b/src/musredit_qt5/forms/PPrefsDialog.ui
@@ -17,7 +17,7 @@
    <string>Preferences</string>
   </property>
   <property name="windowIcon">
-   <iconset resource="../musredit.qrc">
+   <iconset>
     <normaloff>:/images/musrfit.xpm</normaloff>:/images/musrfit.xpm</iconset>
   </property>
   <widget class="QWidget" name="layoutWidget">
@@ -175,6 +175,19 @@
          <string>start with Fourier</string>
         </property>
        </widget>
+       <widget class="QCheckBox" name="fAvg_checkBox">
+        <property name="geometry">
+         <rect>
+          <x>10</x>
+          <y>40</y>
+          <width>231</width>
+          <height>21</height>
+         </rect>
+        </property>
+        <property name="text">
+         <string>start with averaged data/Fourier</string>
+        </property>
+       </widget>
       </widget>
       <widget class="QWidget" name="fMusrt0_tab">
        <attribute name="title">