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Fig. 5


Examples of average power spectral density of the interferometric signals (100 scans) obtained in the high SNR (left) and low SNR (right) regimes. Only a single spectral channel of one baseline is represented. The fringe signal corresponds to the peak at σ = 0.6μm-1 (λ = 1.66μm). The dashed red line is the fit of the underlying bias power by its theoretical form a + bsin2(2πσ/σmax). In the low SNR regime, electronic artifacts can be seen at σ ≈ 0.22μm-1, 0.8μm-1 and 0.97μm-1. In the high SNR regime, the fringe peak is clearly aliased by mechanical vibrations in VLTI (see Sect. 5.6). Figure 3 contains typical interferogram corresponding to these measurements.

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