Available healpy data files
/full_weights/healpix_full_weights_nside_0032.fits
/full_weights/healpix_full_weights_nside_0064.fits
/full_weights/healpix_full_weights_nside_0128.fits
/full_weights/healpix_full_weights_nside_0256.fits
/full_weights/healpix_full_weights_nside_0512.fits
/full_weights/healpix_full_weights_nside_1024.fits
/full_weights/healpix_full_weights_nside_2048.fits
/full_weights/healpix_full_weights_nside_4096.fits