Figure 8: The optimal SNR divided by the SNR of a single Michelson interferometer, as a function
of the Fourier frequency . The sensitivity gain in the low-frequency band is equal to , while
it can get larger than 2 at selected frequencies in the high-frequency region of the accessible band.
The integration time has been assumed to be one year, and the proof mass and optical path noise
spectra are the nominal ones. See the main body of the paper for a quantitative discussion of this
point.