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FITS File Open and Close Subroutines:

1

Open an existing FITS file with readonly or readwrite access

FTOPEN(unit,filename,rwmode, > blocksize,status)

2

Open and initialize a new empty FITS file

FTINIT(unit,filename,blocksize, > status)

3

Close a FITS file previously opened with ftopen or ftinit

FTCLOS(unit, > status)

4

Get the value of an unused I/O unit number which may then be used as input to FTOPEN or FTINIT. This routine is only available in the SPP version of FITSIO.

FSGIOU( > iounit )