Index: /fact/tools/pyscripts/tools/trigger_studies/ftu_comparator_out.py
===================================================================
--- /fact/tools/pyscripts/tools/trigger_studies/ftu_comparator_out.py	(revision 13023)
+++ /fact/tools/pyscripts/tools/trigger_studies/ftu_comparator_out.py	(revision 13024)
@@ -17,4 +17,11 @@
 data_file_name = '/media/daten_platte/FACT/data/20120305_022.fits.gz'
 calib_file_name = '/media/daten_platte/FACT/data/20120305_005.drs.fits.gz'
+if not os.path.isfile(data_file_name):
+    print 'not able to find file:', data_file_name
+    sys.exit(-1)
+if not os.path.isfile(calib_file_name ):
+    print 'not able to find file:', calib_file_name 
+    sys.exit(-1)
+    
 run = RawData(data_file_name, calib_file_name)
 despike = DRSSpikes()
Index: /fact/tools/pyscripts/tools/trigger_studies/ftu_patch_signal.py
===================================================================
--- /fact/tools/pyscripts/tools/trigger_studies/ftu_patch_signal.py	(revision 13023)
+++ /fact/tools/pyscripts/tools/trigger_studies/ftu_patch_signal.py	(revision 13024)
@@ -15,4 +15,11 @@
 data_file_name = '/media/daten_platte/FACT/data/20120305_022.fits.gz'
 calib_file_name = '/media/daten_platte/FACT/data/20120305_005.drs.fits.gz'
+if not os.path.isfile(data_file_name):
+    print 'not able to find file:', data_file_name
+    sys.exit(-1)
+if not os.path.isfile(calib_file_name ):
+    print 'not able to find file:', calib_file_name 
+    sys.exit(-1)
+
 run = RawData(data_file_name, calib_file_name)
 despike = DRSSpikes()