It checks the constraint_sets for all "+" and "M" OBs.
For the sky_transparency, the number of OBs for each of
the four possible constraints will then be listed.
An icon will appear only if at least one OB remains to be executed
with this sky_transparency.
Seeing constraints: the minimum and the maximum seeing value of all "+" and "M" OBs for the run are computed. If both are the same, only one seeing value is given as upper limit for the seeing requested.
Airmass constraints: the minimum and the maximum airmass value of all "+" and "M" OBs for the run are computed. If both are the same, only one airmass value is given as upper limit for the airmass requested.
NOTE: As the time-accounting for ToOs is done directly on the mountains, the information for ToO OBs will usually include all OBs which are checked in and accepted for this run, no matter if they still need to be executed or not.