Fig. 12.

OPD residuals as a function of the fringe tracker S/N. Above an S/N of 10, the best fringe-tracking residuals are limited to a constant value around 80 nm, caused by the intrinsic bandpass of the fringe tracker hardware (dashed line). At lower S/N, the fringe tracker performance decreases because it is difficult to predict and track the evolution of the perturbations. The phase error caused by a readout noise on the phase goes as λ/(2π S/N) (lower dotted line). The actual performances of the fringe tracker shows that the degradation is more likely a factor 2 or 3 above that limit.
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