User manual

By using the “Advanced options” button located in each of the cross-match forms, it is
possible to explicitly choose the columns to be kept, as well as to specify suffix or prefix
for column names.
Columns and UCDs
When the mouse pointer moves over the buttons that select columns, the buttons in
correspondence between the two catalogues will be displayed on a blue background.
This correspondence is based on shared UCDs for these two columns (a UCD is a single
attribute for a column and characterizes its physical meaning – e.g. “pos.eq.dec “for a
declination measure -- see the UCD description in section 5.5).
59