||Positions are in fractional radians.
||Positions are B1950 (equator and equinox 1950.0) right ascension and
||Positions are in fractional degrees.
||Positions are ecliptic longitude and latitude in degrees (/d not
||Right ascension is in fractional hours; declination is in fractional degrees.
||Positions are galactic longitude and latitude in degrees (/d not
||Positions are right ascension and declination as hh.mmssss and dd.mmssss
or hh:mm:ss.sss and dd:mm:ss.sss. Only one digit of hours or degrees
is necessary, but leading zeroes must be present for minutes and seconds.
The number of digits of fractional seconds may vary from zero, in which
case no decimal point is necessary, to ten, where significance is lost.
||Ignore information after position and magnitude.
||Positions are J2000 (equator and equinox 2000.0) right ascension and
||Positions are right ascension in fractional hours and
declination in fractional degrees
(Added in WCSTools 3.7.9)
||No magnitude is present. Use this only if the catalog is being used
only for map centers.
||There are number magnitudes per star, after the right ascension
and declination on the line. (Added in WCSTools 2.8.4)
||The source number is omitted from the beginning of the line.
||The object name replaces the source number at the beginning of the line.
||Proper motions in right ascension and declination (arcseconds per year)
follow the magnitude.
||Coordinate system (J2000, B1950, etc.) provided following each right
ascension and declination. (added in WCSTools 2.6)
||Entries are sorted in increasing right ascension. This speeds up searches.
(added in WCSTools 2.5)
||Two-character spectral type (or other code) follows magnitude, if present,
and precedes velocity, if present.
(added in WCSTools 2.8.5)
||Positions are right ascension as hh mm ss.sss dd mm ss.sss. The
leading zeroes may be omitted on hours, degrees, minutes, and seconds,
and fractional seconds are optional.
|| Catalog positions are in hhmmss.s ddmmss.s as used by the UZC.
||Radial velocity is included after magnitude(s) and before epoch.
|| X Y format (x.xxxxxx y.yyyyy) instead of sky position.
||Column after magnitude (and proper motion and velocity, if present)
contains the epoch of observation as a date in the format yyyy.mmdd.
If >3000, the epoch is assumed to be the Modified Julian Date.
The ISO format, yyyy-mm-ddThh:mm:ss.sss, is also supported.
(Added in WCSTools 2.6, updated in WCSTools 3.2)