Assuming that the atmosphere and receiving system is independent of the
pairs of antenna considered, the previous equation is valid for any
baseline of the interferometer. All the visibilities can be averaged into a
single visibility to define the point source signal. This implies that the
standard deviation (sensitivity) on the point source signal will be divided
by the square root of the number of baselines, i.e., the number of pairs of
antennas,
, where
is the number of
antennas. The point source sensitivity is then