Table 2: Number of photons per frame and per channel needed for the frame to contribute to the ensemble averages, as a function of the observing mode and considering the measured and the potential (vibration-free) atmosphere+VLTI+AMBER visibility.
Mode actual Visibility potential Visibility

Low $V_{\rm actual}=0.12$ $V_{\rm potential}=0.5$

Resolution 581 phots 187 phots

Medium $V_{\rm actual}=0.14$ $V_{\rm potential}=0.6$

Resolution 507 phots 166 phots

**Table 2:** Number of photons per frame and per channel needed for the frame to contribute to the ensemble averages, as a function of the observing mode and considering the measured and the potential (vibration-free) atmosphere+VLTI+AMBER visibility.
Mode	actual Visibility	potential Visibility
Low	$V_{\rm actual}=0.12$	$V_{\rm potential}=0.5$
Resolution	581 phots	187 phots
Medium	$V_{\rm actual}=0.14$	$V_{\rm potential}=0.6$
Resolution	507 phots	166 phots

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