CLIC\SET OBSERVED d1 d2
FIND will select all observations with observing dates between d1 and
d2. Default is * *.
d1 and d2 are normally in explicit form (jj-mmm-yyyy) but internal day
numbers are also accepted, i.e. something like SET OBSERVED 'DOBS-1' in-
ternal format and is available after the command VARIABLE GENERAL ON has
been issued).