Code to track muon paths in a singe module of GRAPES-3 In order to run the program, use the corsikarootreader.cpp file Data about the detector will be extracted from the prc_coordinates.txt file. No changes needed to be made. Data from Corsika simulation is needed to be provided in form of a .root file. Change the file name in corsikarootreader.cpp in order to select the correct data file.