Index: /fact/tools/pyscripts/examples/CalFactFitsTest.py
===================================================================
--- /fact/tools/pyscripts/examples/CalFactFitsTest.py	(revision 16990)
+++ /fact/tools/pyscripts/examples/CalFactFitsTest.py	(revision 16991)
@@ -14,4 +14,6 @@
 
 from ROOT import gSystem
+gSystem.Load("izstream_h.so") #Not always necessary
+gSystem.Load("factfits_h.so") #Not always necessary
 gSystem.Load("calfactfits_h.so")
 from ROOT import *
Index: /fact/tools/pyscripts/pyfact/calfactfits.h
===================================================================
--- /fact/tools/pyscripts/pyfact/calfactfits.h	(revision 16990)
+++ /fact/tools/pyscripts/pyfact/calfactfits.h	(revision 16991)
@@ -2,5 +2,5 @@
 //
 // Class CalFactFits
-// Wrapper class for fits.h or pyfits.h
+// Wrapper class for factfits.h (or fits.h, pyfits.h)
 // Provides fast access to calibrated events of FACT raw files
 //
@@ -17,4 +17,6 @@
 // root [3] .L calfactfits.h++
 // 
+// Try /usr/lib/x86_64-linux-gnu/libz.so at ETH for the libz.so file.
+//
 // Note: the produced izstream_h.so must be in LD_LIBRARY_PATH, e.g.
 // export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/guest/kraehenb/software/PythonIncludes/
@@ -101,6 +103,21 @@
 		//Read basic parameters of the two files
 //		std::cout << "...Reading basic file parameters..." << std::endl;
-		calib_nroi = calibfile.GetUInt("NROI");
-		calib_npix = calibfile.GetUInt("NPIX");
+		try {
+			calib_nroi = calibfile.GetUInt("NROI");
+		}
+		catch(runtime_error &err) {
+			std::cout << err.what() << std::endl;
+			std::cout << "Standard value NROI=1024 assumed." << std::endl;
+			calib_nroi = 1024;
+		}
+		try {
+			calib_npix = calibfile.GetUInt("NPIX");
+		}
+		catch(runtime_error &err) {
+			std::cout << err.what() << std::endl;
+			std::cout << "Standard value NPIX=1440 assumed." << std::endl;
+			calib_npix = 1440;
+		}
+		
 		data_nroi = datafile.GetUInt("NROI");
 		data_npix = datafile.GetUInt("NPIX");