\datatype = fitshdr
| cntr |      ra     |     dec     |      cra     |     cdec     |naxis1|naxis2| ctype1 | ctype2 |     crpix1    |     crpix2    |    crval1   |    crval2   |      cdelt1     |      cdelt2     |   crota2    |equinox | hdu  | fname  |
| int  |    double   |    double   |      char    |    char      | int  | int  |  char  |  char  |     double    |     double    |    double   |    double   |      double     |      double     |   double    |  double| int  | char   |