Name         Type    Unit  Description
_healpix_19  int64   none  "HEALPix order 19 pixel index."
_healpix_9   int32   none  "HEALPix order 9 pixel index."
_healpix_29  int64   none  "HEALPix order 29 pixel index."
Norder       uint8   none  "Partition column. HEALPix order."
Npix         uint64  none  "Partition column. HEALPix pixel index."
oid          int64   none  "Unique object identifier"