coordinate system can be Equatorial, Galactic, or Ecliptic (in fact the code just matches
the first two characters case insensitive so "ga" is adequate).  Where appropriate, the system
can be followed by epoch/equinox information (B/J for Besselian/Julian and a year).  Of course
this only applies to Equatorial and Ecliptic since Galactic does not precess.</p>

<p>The symbol directive sets the reference size for symbols and their shape.  The size can be
one of three variants:  a relative size (based on a fra