Fig. 6.

Phase Φi, j (upper panel) and group Ψi, j (lower panel) delays. All values are phases modulo 2π. The dashed lines correspond to the piezo command. From bottom to top, the phases correspond to baselines i, j equal to 12, 13, 14, 23, 24, and 34. At the beginning of this recording, the system only has fringes on two baselines (green and purple). At t = 0.8 s, the system found fringes on the yellow baseline, and later on all the other baselines. Gray areas correspond to the baselines whose S/N is below the value , meaning that no tracking is performed. After t = 1.4 s, the system nominally tracks on all baselines.
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