The goal of a time estimator is to find the elapsed telescope time
) needed to obtain a given rms noise, while a sensitivity estimator
aims at finding the rms noise obtained when observing during
is the total integration time spent both on the on-source and
off-source observations, then
The tuning of the receivers is not proportional to the total integration time but it should be added to the elapsed telescope time. A time estimator can hardly anticipate the total tuning time for a project. Indeed, one project (e.g. faint line detection) can request only one tuning to be used during many hours and another (e.g. line survey) can request a tuning every few minutes. In our case, we thus request that the estimator user add by hand the tuning time to the elapsed telescope time estimation.