psf_fwhm.fits:  A FITS bintable giving the zero-order FWHM vs off-axis
		angle.  This table is used to determine the zero-order
		region size.


  No. Type     EXTNAME      BITPIX Dimensions(columns)      PCOUNT  GCOUNT
 
   0  PRIMARY                  8     0                           0    1
   1  BINTABLE PSF_FWHM        8     8(2) 13                     0    1

___Column_Names_________Formats______Dims______Units___
OFFAXIS                    E                   arcmin
FWHM                       E                   arcsec