Fig. 5.

Upper panel: signal from the modulation block, in radians (the Volts-to-radians gain is not accounted for here). At each science exposure (here 5 s), the umodulation values change to make π offsets between the baselines. The signal repeats every four science exposures so that each baseline is observed with as many +π/2 as −π/2 offsets. Lower panel: modified sawtooth signal to search for fringes when the fringe tracker is in SEARCHING state. Here the research is made on all telescopes, meaning that the rank of matrix is 0.
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