Here are the data structures with brief descriptions:
| Cauxprm | Additional auxiliary parameters | 
| Ccelprm | Celestial transformation parameters | 
| Cdisprm | Distortion parameters | 
| Cdpkey | Store for DPjaandDQiakeyvalues | 
| Cfitskey | Keyword/value information | 
| Cfitskeyid | Keyword indexing | 
| Clinprm | Linear transformation parameters | 
| Cprjprm | Projection parameters | 
| Cpscard | Store for PSi_makeyrecords | 
| Cpvcard | Store for PVi_makeyrecords | 
| Cspcprm | Spectral transformation parameters | 
| Cspxprm | Spectral variables and their derivatives | 
| Ctabprm | Tabular transformation parameters | 
| Cwcserr | Error message handling | 
| Cwcsprm | Coordinate transformation parameters | 
| Cwtbarr | Extraction of coordinate lookup tables from BINTABLE |