Index: fact/tools/rootmacros/openFits.c
===================================================================
--- fact/tools/rootmacros/openFits.c	(revision 12509)
+++ fact/tools/rootmacros/openFits.c	(revision 12509)
@@ -0,0 +1,115 @@
+// Opens FACT Fits Raw Data  -- for more Info refer to header file
+size_t openDataFits(
+	const char *datafilename,		// path to fits file containing FACT raw data
+	fits * * datafile,				// ptr to pointer, where to return the fits object
+	vector<int16_t> &Data,			// vector, which will be filled with raw data
+	vector<int16_t> &StartCells,	// vector, which will be filled with DRS start positions
+	unsigned int &EventID,			// index of the current event
+	UInt_t &RegionOfInterest,		// Width of the Region, read out of the DRS
+	UInt_t &NumberOfPixels,			// Total number of pixel, read out of the camera
+	size_t &PXLxROI,				// Size of column "Data" = #Pixel x ROI
+			// this can be used, to x-check RegionOfInterest and NumberOfPixels
+	int VerbosityLevel				//
+) {
+	size_t NumberOfEvents;
+	*datafile = new fits(datafilename);
+	if (!(*(*datafile))) {
+		if (VerbosityLevel > 0)
+			cout << "Couldn't properly open the datafile: " << datafilename << endl;
+		return 0;
+	}
+
+	NumberOfEvents = (*datafile)->GetNumRows();
+	if (NumberOfEvents < 1){
+		if (VerbosityLevel > 0){
+			cout << "Warning in FOpenDataFile of file: " << datafilename << endl;
+			cout << "the file contains no events." << endl;
+		}
+	}
+
+	RegionOfInterest = (*datafile)->GetUInt("NROI");
+	NumberOfPixels = (*datafile)->GetUInt("NPIX");
+
+	// I am not really sure, why anybody should be interested in this number
+	// It can be used for the sanity check, which follows only ... I guess.
+	PXLxROI = (*datafile)->GetN("Data");
+
+	if ( RegionOfInterest * NumberOfPixels != PXLxROI) // something in the file went wrong
+	{
+		if (VerbosityLevel > 0){
+			cout << "Warning in FOpenDataFile of file: " << datafilename << endl;
+			cout << "RegionOfInterest * NumberOfPixels != PXLxROI" << endl;
+			cout << "--> " << RegionOfInterest;
+			cout << " * " << NumberOfPixels;
+			cout << " = " << RegionOfInterest * NumberOfPixels;
+			cout << ", but PXLxROI =" << PXLxROI << endl;
+		}
+		return 0;
+	}
+
+	//Set the sizes of the data vectors
+	Data.resize(PXLxROI, 0);
+	StartCells.resize(NumberOfPixels, 0);
+
+	//Link the data to variables
+	(*datafile)->SetRefAddress("EventNum", EventID);
+	(*datafile)->SetVecAddress("Data", Data);
+	(*datafile)->SetVecAddress("StartCellData", StartCells);
+
+	return NumberOfEvents;
+}
+
+size_t openCalibFits(
+	const char *FileName,			// path to fits file
+	vector<float> &Offset,
+	vector<float> &Gain,
+	vector<float> &TriggerOffset,
+	int VerbosityLevel	
+)
+{
+	size_t NumberOfEvents = 0;
+
+	// sizes of the data vectors
+	size_t Offset_size;
+	size_t Gain_size;
+	size_t TriggerOffset_size;
+
+	fits * datafile = new fits( FileName );
+	if (!(*datafile)) {
+		if (VerbosityLevel > 0)
+			cout << "Couldn't properly open the file: " << FileName << endl;
+		return 0;
+	}
+
+	NumberOfEvents = datafile->GetNumRows();
+	if (NumberOfEvents < 1){
+		if (VerbosityLevel > 0){
+			cout << "Warning during open of file: " << FileName << endl;
+			cout << "the file contains no events." << endl;
+			return 0;
+		}
+	}
+
+	// only if the user really wants, this stuff is output
+	if (VerbosityLevel > 1){
+ 	 cout << "----------------- DRS Calib Header -----------------" << endl;
+ 	 datafile->PrintKeys();
+ 	 cout << "---------------- DRS Calib Columns -----------------" << endl;
+ 	 datafile->PrintColumns();
+	}
+
+	Offset_size = datafile->GetN("BaselineMean");
+	Gain_size = datafile->GetN("GainMean");
+	TriggerOffset_size = datafile->GetN("TiggerOffsetMean");
+
+  Offset.resize(Offset_size, 0);
+  Gain.resize(Gain_size, 0);
+  TriggerOffset.resize(TriggerOffset_size, 0);
+
+  datafile->SetVecAddress("BaselineMean", Offset);
+  datafile->SetVecAddress("GainMean", Gain);
+  datafile->SetVecAddress("TriggerOffsetMean", TriggerOffset);
+  datafile->GetRow(0); //Read the calibration data
+
+  return NumberOfEvents;
+}
Index: fact/tools/rootmacros/openFits.h
===================================================================
--- fact/tools/rootmacros/openFits.h	(revision 12509)
+++ fact/tools/rootmacros/openFits.h	(revision 12509)
@@ -0,0 +1,28 @@
+#ifndef __OPENFITS__H
+#define __OPENFITS__H
+
+#include <cstdio>
+
+size_t openDataFits(
+	const char *datafilename,		// path to fits file containing FACT raw data
+	fits * * datafile,				// ptr to pointer, where to return the fits object
+	vector<int16_t> &Data,			// vector, which will be filled with raw data
+	vector<int16_t> &StartCells,	// vector, which will be filled with DRS start positions
+	unsigned int &EventID,			// index of the current event
+	UInt_t &RegionOfInterest,		// Width of the Region, read out of the DRS
+	UInt_t &NumberOfPixels,			// Total number of pixel, read out of the camera
+	size_t &PXLxROI,				// Size of column "Data" = #Pixel x ROI
+			// this can be used, to x-check RegionOfInterest and NumberOfPixels
+	int VerbosityLevel				//
+);
+
+size_t openCalibFits(
+  const char *FileName,     // path to fits file
+  vector<float> &Offset,
+  vector<float> &Gain,
+  vector<float> &TriggerOffset,
+  int VerbosityLevel
+);
+
+
+#endif //__OPENFITS__H