The following figures give achievable S/N ratios (where N is r.m.s.
noise) in one hour integrations when observing with an intermediate modulation
frequency of 143 Hz. The S/N for different resolutions is proportional
to
.
Note that under detector noise limited conditions (appropriate where the slope of the lines in the figures is 1) the S/N is improved by a factor of approximately two when a modulation frequency of 20 Hz is used.
