tapelabel 		JL5499
dataSource		ganglog		# ganglog, mt, spectro
device			/dev/mt/tps3d6nrnsvc		# tape drive

typedef enum {
        ASTROGANG, 	# GANG files for a single imaging run
        PHOTOGANG,	# GANG files for a single imaging run
	LOG,		# log files for a single imaging night
	MT,		# all files for a single MT night
	SPECTRO,	# all files for a single spectro night
	TPM		# all TPM files for a single night
} TARCONTENTS;


typedef struct {
   int filemarks;		# number of filemakrs to skip to get here
   TARCONTENTS contents;	# GANG, LOG, SPECTRO, MT
   int id;			# mjd for logs, run number for gangs
} TARFILE; 


tarfile 1 LOG 52521
tarfile 2 ASTROGANG 3319
tarfile 3 PHOTOGANG 3319
tarfile 4 ASTROGANG 3320
tarfile 5 PHOTOGANG 3320
tarfile 6 SPECTRO 52521
tarfile 7 TPM 52521