
  region RA DEC Radius [projection]

  define the current sky region and optionally the projection.  
  RA, DEC and Radius are all values in decimal degrees.  The possible 
  values for "projection" are:

  TAN - a tangent plane projection (default, and typical for optical images)
  SIN - a sine plane projection (more appropriate for polar regions)
  AIT - aitoff projection (good for the full sky)
  GLS - ?? (also good for the full sky)

  optional orientation flags:

  -ew : display with East Left (default)
  +ew : display with East Right 
  -ns : display with North Down
  +ns : display with North Up (default)
