Display the cross-identifications for a reference

It is possible with the command tab to display on the screen the cross-references for all stars in a reference. There are two possible syntaxes:

The first one produces a list sorted according to the star numbers of the chosen reference
The second one displays the output in the BDA number order.

Examples:

tab -l 3 lists the correspondances for the stars in reference 3 and sort them
tab -l asks for the reference number and displays the cross-references in the BDA number order