## Collecting the measurements from all baselines

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

| (7)

where is the average for the different baseline.