Map of the ratio between contrast uncertainty and kernel output uncertainty as a function of RA and Dec for the VLTI-4UT configuration. The map uses a logarithmic stretch, ranging from –0.3 (σc = 0.5 × σk) in the most favorable configurations to ∼3 (σc = 103 × σk) near the null. The median ratio is σc = 0.8 × σk.
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