# This is the source of the utypelist in Appendix A.	See the comment there.
stc:AstroCoords.Time.TimeInstant	date and time of an observation or event
stc:AstroCoords.Time.TimeInstant.Error	associated error
stc:AstroCoordArea.TimeInterval.StartTime	date and time of the beginning of an observation or event
stc:AstroCoordArea.TimeInterval.StartTime.Error	associated Error
stc:AstroCoordArea.TimeInterval.StopTime	date and time of the end of an observation or event
stc:AstroCoordArea.TimeInterval.StopTime.Error	associated Error
stc:AstroCoords.Position2D.Value2.C1	first component (e.g., right ascension or longitude on a sphere) of a 2D position
stc:AstroCoords.Position2D.Value2.C2	second component (e.g., declination or latitude on a sphere) of a 2D position
stc:AstroCoords.Position2D.Error2.C1	error in the first component of a 2D position
stc:AstroCoords.Position2D.Error2.C2	error in the second component of a 2D position
stc:AstroCoords.Position2D.Error2Radius	error radius of a 2D position
stc:AstroCoords.Position2D.Epoch	point in time the positions are reduced to using given proper motions\footnote{Not part of the STC data model yet.	See section~\ref{subsec:pairser}}
stc:AstroCoords.Position2D.Epoch.yearDef	(see Epoch utype)
stc:AstroCoords.Velocity2D.Value2.C1	first component of 2D proper motion
stc:AstroCoords.Velocity2D.Value2.C2	second component of 2D proper motion
stc:AstroCoords.Velocity2D.Error2.C1	error in the first component of 2D proper motion
stc:AstroCoords.Velocity2D.Error2.C2	error in the second component of 2D proper motion
stc:AstroCoords.Velocity2D.Error2Radius	error radius for a 2D proper motion
stc:AstroCoords.Spectral.Value	a frequency or wavelength
stc:AstroCoords.Redshift.Value	a redshift (or radial velocity when position is 2D)
stc:AstroCoordSystem.TimeFrame.TimeScale	takes values like TT, TAI, UTC, TDB, LST, or LOCAL 
stc:AstroCoordSystem.TimeFrame.ReferencePosition	takes values like TOPOCENTER, BARYCENTER, HELIOCENTER, GEOCENTER, GALACTIC\_CENTER, RELOCATABLE, UNKNOWNRefPos, or planet names
stc:AstroCoordSystem.SpaceFrame.CoordFlavor	takes values like SPHERICAL, CARTESIAN, POLAR; 2D-spherical implied for common reference frames if omitted
stc:AstroCoordSystem.SpaceFrame.CoordFlavor.naxis	number of axes in the coordinate system
stc:AstroCoordSystem.SpaceFrame.CoordRefFrame	takes values like ICRS, FK5, FK4, ECLIPTIC, GALACTIC, SUPER\_GALACTIC, J2000, B1950
stc:AstroCoordSystem.SpaceFrame.ReferencePosition	see stc:AstroCoordSystem.TimeFrame.ReferencePosition
stc:AstroCoordSystem.SpectralFrame.ReferencePosition	see stc:AstroCoordSystem.TimeFrame.ReferencePosition; additionally, values like LSR, LSRK, LSRD are admitted.
stc:AstroCoordSystem.RedshiftFrame.ReferencePosition	see stc:AstroCoordSystem.SpectralFrame.ReferencePosition
stc:AstroCoordSystem.RedshiftFrame.DopplerDefinition	OPTICAL, RADIO, or RELATIVISTIC
stc:AstroCoordSystem.RedshiftFrame.value\_type	REDSHIFT or VELOCITY
stc:AstroCoordArea.Position2VecInterval.HiLimit2Vec.C2	largest value of the second component in a 2D spatial interval (a ``box'')
stc:AstroCoordArea.Position2VecInterval.HiLimit2Vec.C1	largest value of the first component in a 2D spatial interval (a ``box'')
stc:AstroCoordArea.Position2VecInterval.LoLimit2Vec.C2	smallest value of the second component in a 2D spatial interval (a ``box'')
stc:AstroCoordArea.Position2VecInterval.LoLimit2Vec.C1	smallest value of the first component in a 2D spatial interval (a ``box'')
stc:AstroCoords.Time.Resolution	The resolution of a time axis
stc:AstroCoordArea.SpectralInterval.HiLimit	the upper limit of a range of frequencies
stc:AstroCoordArea.SpectralInterval.LoLimit	the lower limit of a range of frequencies
stc:AstroCoords.Position2D.Resolution2.C1	the resolution of the first component of a 2D spatial position
stc:AstroCoords.Position2D.Resolution2.C2	the resolution of the second component of a 2D spatial position
stc:AstroCoords.Position2D.Resolution2Radius	resolution of a 2D spatial position specification
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