Fig. 14.

Power spectrum density and cumulative sum of the power spectrum density of phase residuals (2.2 μm/2π × Φn) toward target IRS 16C. The red curves are the pseudo-open-loop values, i.e., in the hypothesis of no fringe tracker (2.2 μm/2π × ΦATM, n). The blue curves correspond to power spectral densities of 1 f−2 μm2/Hz and 0.001 μm2/Hz. The six lower plots are the reverse cumulative sum of the power spectrum. At zero frequency, the sum reaches 220 nm on average over the six baselines.
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