table3.tex

\begin{table}[!htbp]
\smallskip
\begin{center}
   {\small
   \begin{tabular} {|l | p{6cm}| c| c|}
   \hline
   {\bf Keyword} & {\bf Definition} & {\bf MOC1.1} & {\bf MOC2.0} \\
   \hline
   MOCVERS  & The version of the MOC encoding standard. If it is following this document (TMOC, STMOC and STMOC), it {\bf must} be '2.0'. If not defined it is assumed to be 1.1. & NA & mandatory \\
   MOCDIM	    & Physical(s) dimension(s). Either 'SPACE' for SMOC, 'TIME' for TMOC or 'TIME.SPACE' for STMOC. If omitted, 'SPACE' is assumed for backward compatibility. & NA & mandatory \\
   ORDERING & The packaging method used. It is either NUNIQ (V1.1 or V2.0 SMOC) or RANGE (V2.0). & mandatory & mandatory \\
   COORDSYS & The coordinate system in use. The value {\bf must} be 'C' for SMOC (ICRS). & mandatory & mandatory  \\
   TIMESYS  &  The time system in use. The value {\bf must} be 'TCB' for TMOC.  & NA & mandatory \\
   MOCID    & Original data identifier. For MOCs that are coverages of VO resources, in particulary those used in VODataService 1.2 coverage elements \citep{2021ivoa.spec.1102D}, MOCID can contain the IVOA id of the VO resource described. & optional & optional \\
   MOCTOOL  & The name of the MOC software generator. It is also recommended to add the software version number to its name. & optional & optional \\
   MOCTYPE  & Provenance data type. Either 'IMAGE', or 'CATALOG'. In the first case for areas computed from existing images and/or footprint or even STC strings, in the second case for areas computed from a collection of point sources using a unique and/or derived area. & optional & optional \\
   MOCORD\_S  & Best resolution of the space dimension, expressed as the order. & NA & mandatory\\
   MOCORD\_T  & Best resolution of the time dimension, expressed as the order. & NA & mandatory \\
   MOCORDER & Best resolution of the space dimension, expressed as the order. & mandatory & NA \\
   PIXTYPE & 'HEALPIX'  & mandatory & NA \\
   \hline
   \end{tabular}
   }
\end{center}
\caption{FITS Keywords for MOC.}
\label{table:fits_stmoc}
\end{table}