Choosing
File
Exposure Time Calculator...
in the OT Menu bar
will launch a separate window which provides a simple interface to the Exposure
Time Calculator for ALMA observations. The ETC can also be launched from the
Spectral Form of a RegionofInterest in the Science View. It implements a realistic
but simple formula for the estimation of ALMA exposure time to reach a given
sensitivity for unresolved (point) sources or a limited surface brightness
sensitivity for extended sources. The ETC also provides the inverse facility,
estimated sensitivity given an input exposure time. It makes use of a first version
of the Observatory Receiver Expert (to obtain estimates of receiver system temperatures).