int ReadARF(char *filename, long ARFnumber, struct ARF *arf)
Read the effective areas from a FITS file - if there are multiple SPECRESP extensions then read the ARFFnumber instance.
int WriteARF(char *filename, struct ARF *arf)
Write the ARF to a FITS file.
void DisplayARF(struct ARF *arf)
Write information about ARF to stdout.
int AddARF(struct ARF *arf1, struct ARF *arf2)
Add arf2 onto arf1.
long MergeARFRMF(struct ARF *arf, struct RMF *rmf)
Multiply the ARF into the RMF.