Some tables have constant values associated with them; these may represent such things as the epoch at which observations were taken, the name of the catalogue, an angular resolution associated with all observations, or any number of other things. Such constants are known as table parameters (not to be confused with parameters passed to STILTS commands) and can be thought of as extra columns which have the same value for every row. The values of such parameters can be referenced in STILTS algebraic expressions as follows:
param$
.
ucd$
. Any punctuation marks in the
UCD should be replaced by underscores, and a trailing underscore
is interpreted as a wildcard. See Section 10.1 for
more discussion.
utype$
. Any punctuation marks in the
Utype should be replaced by underscores. See Section 10.1 for
more discussion.