The first 28 bytes of IRAS.ps contain the following information:
Integer*4 STAR0=0 Subtract from star number to get sequence number
Integer*4 STAR1=1 First star number in file
Integer*4 STARN=245889 Number of stars in file
Integer*4 STNUM=1 0 if no star i.d. numbers are present
1 if star i.d. numbers are in catalog file
2 if star i.d. numbers are in file
Logical*4 MPROP=f True if proper motion is included
False if no proper motion is included
Integer*4 NMAG=4 Number of magnitudes present
Integer*4 NBENT=30 Number of bytes per star entry