Format specifications
- healpix_fits_specs.pdf


Example FITS files
- full_TQU.fits:  full sky TQU data   (with 3 columns TEMPERATURE, Q_POLARISATION, U_POLARISATION)

- partial_T.fits: partial T only data (with 2 columns PIXEL, TEMPERATURE)
- partial_TQU.fit partial TQU data    (with 4 columns PIXEL, TEMPERATURE, Q_POLARISATION, U_POLARISATION)

- cut_T.fits:     cut sky T+noise stat. data (with 4 columns PIXEL, SIGNAL, N_OBS, SERROR)
- cut_TQU.fits:   cut sky TQU+noise stat. data (with 4 columns PIXEL, SIGNAL, N_OBS, SERROR in 3 extensions)