S/N measured in the H band as a function of target magnitude observed during commissioning phases #7, #8 and #9 for HE mode (blue) and HA mode (green). S/N values are scaled to 5 min for bright (H < 9) and 15 min for fainter targets. The full line and dotted line represent the expected S/N from the Exposure Time Calculator for HE and HA mode, respectively. The upper envelope of the measured S/N, corresponding to optimum astroclimatic conditions, fits with the expected value.