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<p>
gastro2 is the successor to gastro.  The gastro2 program determines
the astrometric transformation for an image based on the cmp/smp file.
This file contains both the table of object data and the complete
image FITS header.  Using the header astrometric information as a
starting point, gastro2 loads the reference astrometry objects
appropriate for the region and determines the matching objects between
the image and the reference.  These objects are used, with iteration
to improve the sample, to determine the astrometric transformation
with up to 3rd order polynomials.

<pre>
gastro filtname.cmp
options:
  -h
  -help
  -v
  -p (photcode)
  -plot
  -maglims
  -nstars
  -fx
  -fy
  -coords (ra) (dec)
  -dump
  -mdmp
  -cdmp
  -loneos

gastro2 configuration variables:
OFFSET_RADIUS     - unused
MIN_MATCHES	  - unused
DEFAULT_RADIUS	  - unused
MINIMUM_RADIUS	  -
MAX_ERROR	  -
MAX_NONLINEAR	  -
MAX_PRECISE	  -
CCD_PC1_1	  -
CCD_PC2_2	  -
CCD_PC1_2	  -
CCD_PC2_1	  -
ASEC_PIX	  -
NFIELD		  -
NPOLYTERMS	  -
ROT_ZERO	  -
dROT		  -
NROT		  -
POLAR_ALIGNMENT	  -
GSCFILE		  -
GSCDIR		  -
2MASS_DIR         -
POLAR_AXIS_RA     -
POLAR_AXIS_DEC    -
RA_OFFSET         -
DEC_OFFSET        -
LONEOS_REGIONS    - 
USNO_CDROM        -
ASTRO_REFCAT      - 
CATDIR            - 
ROUGH_ASTROMETRY  - 
PHOTCODE_FILE     -
GASTRO_MAX_NSTARS -

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