diff --git a/pyzebra/app/input_controls.py b/pyzebra/app/input_controls.py
index 7e374ec..f9a45f6 100644
--- a/pyzebra/app/input_controls.py
+++ b/pyzebra/app/input_controls.py
@@ -9,7 +9,14 @@ import pyzebra
 
 
 class InputControls:
-    def __init__(self, dataset, dlfiles, on_file_open=lambda: None, on_monitor_change=lambda: None):
+    def __init__(
+        self,
+        dataset,
+        dlfiles,
+        merge_matching_scans,
+        on_file_open=lambda: None,
+        on_monitor_change=lambda: None,
+    ):
         doc = curdoc()
         log = doc.logger
 
@@ -55,10 +62,14 @@ class InputControls:
 
                 if not new_data:  # first file
                     new_data = file_data
-                    pyzebra.merge_duplicates(new_data, log=log)
+                    if merge_matching_scans:
+                        pyzebra.merge_duplicates(new_data, log=log)
                     dlfiles.set_names([base] * dlfiles.n_files)
                 else:
-                    pyzebra.merge_datasets(new_data, file_data, log=log)
+                    if merge_matching_scans:
+                        pyzebra.merge_datasets(new_data, file_data, log=log)
+                    else:
+                        new_data.extend(file_data)
 
             if new_data:
                 dataset.clear()
@@ -83,7 +94,10 @@ class InputControls:
                         continue
 
                 pyzebra.normalize_dataset(file_data, monitor_spinner.value)
-                pyzebra.merge_datasets(dataset, file_data, log=log)
+                if merge_matching_scans:
+                    pyzebra.merge_datasets(dataset, file_data, log=log)
+                else:
+                    dataset.extend(file_data)
 
             if file_data:
                 on_file_open()
@@ -107,10 +121,14 @@ class InputControls:
 
                 if not new_data:  # first file
                     new_data = file_data
-                    pyzebra.merge_duplicates(new_data, log=log)
+                    if merge_matching_scans:
+                        pyzebra.merge_duplicates(new_data, log=log)
                     dlfiles.set_names([base] * dlfiles.n_files)
                 else:
-                    pyzebra.merge_datasets(new_data, file_data, log=log)
+                    if merge_matching_scans:
+                        pyzebra.merge_datasets(new_data, file_data, log=log)
+                    else:
+                        new_data.extend(file_data)
 
             if new_data:
                 dataset.clear()
@@ -136,7 +154,10 @@ class InputControls:
                         continue
 
                 pyzebra.normalize_dataset(file_data, monitor_spinner.value)
-                pyzebra.merge_datasets(dataset, file_data, log=log)
+                if merge_matching_scans:
+                    pyzebra.merge_datasets(dataset, file_data, log=log)
+                else:
+                    dataset.extend(file_data)
 
             if file_data:
                 on_file_open()
diff --git a/pyzebra/app/panel_ccl_integrate.py b/pyzebra/app/panel_ccl_integrate.py
index 4bcf653..e9e51d9 100644
--- a/pyzebra/app/panel_ccl_integrate.py
+++ b/pyzebra/app/panel_ccl_integrate.py
@@ -108,7 +108,11 @@ def create():
         app_fitctrl.update_result_textarea(scan)
 
     app_inputctrl = app.InputControls(
-        dataset, app_dlfiles, on_file_open=_init_datatable, on_monitor_change=_update_plot
+        dataset,
+        app_dlfiles,
+        merge_matching_scans=True,
+        on_file_open=_init_datatable,
+        on_monitor_change=_update_plot,
     )
 
     # Main plot
diff --git a/pyzebra/app/panel_param_study.py b/pyzebra/app/panel_param_study.py
index 903e02b..8919d91 100644
--- a/pyzebra/app/panel_param_study.py
+++ b/pyzebra/app/panel_param_study.py
@@ -205,7 +205,11 @@ def create():
         _update_overview()
 
     app_inputctrl = app.InputControls(
-        dataset, app_dlfiles, on_file_open=_init_datatable, on_monitor_change=_monitor_change
+        dataset,
+        app_dlfiles,
+        merge_matching_scans=False,
+        on_file_open=_init_datatable,
+        on_monitor_change=_monitor_change,
     )
 
     # Main plot