diff --git a/eos/file_reader.py b/eos/file_reader.py
index 98cf94a..598647e 100644
--- a/eos/file_reader.py
+++ b/eos/file_reader.py
@@ -327,6 +327,8 @@ class AmorEventData:
         # return a new dataset with just events that occured in given time slice
         if not 'wallTime' in self.data.events.dtype.names:
             raise ValueError("This dataset is missing a wallTime that is required for time slicing")
+        # convert from seconds to epoch integer values
+        start , end = start*1e9, end*1e9
         event_filter = self.data.events.wallTime>=start
         event_filter &= self.data.events.wallTime<end
         pulse_filter = self.data.pulses.time>=start
diff --git a/eos/projection.py b/eos/projection.py
index 3536eab..e6a7c5b 100644
--- a/eos/projection.py
+++ b/eos/projection.py
@@ -40,8 +40,10 @@ class ProjectedReflectivity:
             scale = (self.R[filter_q]/self.dR[filter_q]).sum()/(self.R[filter_q]**2/self.dR[filter_q]).sum()
             self.scale(scale)
             logging.info(f'      scaling factor = {scale}')
+            return scale
         else:
             logging.warning('      automatic scaling not possible')
+            return 1.0
 
     def stitch(self, other: 'ProjectedReflectivity'):
         # find scaling factor between two reflectivities at points both are not zero
@@ -56,8 +58,10 @@ class ProjectedReflectivity:
             scale = (R1**2*R2**2/(dR1**2*dR2**2)).sum() / (R1**3*R2/(dR1**2*dR2**2)).sum()
             self.scale(scale)
             logging.info(f'      scaling factor = {scale}')
+            return scale
         else:
             logging.warning('      automatic scaling not possible')
+            return 1.0
 
     def subtract(self, R, dR):
         # subtract another dataset with same q-points
diff --git a/eos/reduction.py b/eos/reduction.py
index 8e14e67..3a2a6ec 100644
--- a/eos/reduction.py
+++ b/eos/reduction.py
@@ -148,11 +148,13 @@ class AmorReduction:
 
 
         if self.reduction_config.timeSlize:
-            self.read_timeslices(i)
+            if i>0:
+                logging.warning("    time slizing should only be used for on set of datafiles, check parameters")
+            self.analyze_timeslices(i)
         else:
-            self.read_unsliced(i)
+            self.analyze_unsliced(i)
 
-    def read_unsliced(self, i):
+    def analyze_unsliced(self, i):
         self.monitor = np.sum(self.dataset.data.pulses.monitor)
         logging.warning(f'    monitor = {self.monitor:8.2f} {MONITOR_UNITS[self.experiment_config.monitorType]}')
 
@@ -228,8 +230,7 @@ class AmorReduction:
                 self.datasetsRlt.append(orso_data)
                 j += 1
 
-    def read_timeslices(self, i):
-        # TODO: warn when using multiple short_codes
+    def analyze_timeslices(self, i):
         wallTime_e = np.float64(self.dataset.data.events.wallTime)/1e9
         pulseTimeS = np.float64(self.dataset.data.pulses.time)/1e9
         interval = self.reduction_config.timeSlize[0]
@@ -261,10 +262,14 @@ class AmorReduction:
             result = proj.project_on_qz()
 
             if self.reduction_config.autoscale:
-                if i==0:
-                    result.autoscale(self.reduction_config.autoscale)
+                # scale every slice the same
+                if ti==0:
+                    if i==0:
+                        atscale = result.autoscale(self.reduction_config.autoscale)
+                    else:
+                        atscale = result.stitch(self.last_result)
                 else:
-                    result.stitch(self.last_result)
+                    result.scale(atscale)
 
             if self.subtract:
                 if len(result.Q)==len(self.sq_q):