Data Structures
Here are the data structures with brief descriptions:
  | celprm | Celestial transformation parameters | 
  | fitskey | Keyword/value information | 
  | fitskeyid | Keyword indexing | 
  | linprm | Linear transformation parameters | 
  | prjprm | Projection parameters | 
  | pscard | Store for PSi_makeyrecords | 
  | pvcard | Store for PVi_makeyrecords | 
  | spcprm | Spectral transformation parameters | 
  | spxprm | Spectral variables and their derivatives | 
  | tabprm | Tabular transformation parameters | 
  | wcserr | Error message handling | 
  | wcsprm | Coordinate transformation parameters | 
  | wtbarr | Extraction of coordinate lookup tables from BINTABLE |