- Data runs
- The sum of the data taking time of all data runs of the night with
less than 30min calculated as the difference between the time stamp
of closing and opening time of the run.
- All runs
- Same as Onle data runs but including all other run types such
as pedestal, drs calibration etc., which have a source name set. This
is usually the case if the telescope is tracking a source during the
run. This does not include times as repositioning times when the
no data acquisition was active.
- First-to-last
- This is the time difference between the end time of the last run of
the night and the start time of the first run of the night. This
corresponds roughly to the time the telescope is operated and is
a measure whether startup and shutdown was properly scheduled.
- Twilight
- This is the time of astronomical twilight which - in the ideal case -
corresponds to the maximum data taking time.
On average 42% (10h) of a night is twilight. So a data taking efficiency
of 50% twlight means a total duty cycle of 21%.