Overall efficiency curves of NIRPS measured on the spectrophotometric standard star HR1544 observed on 3 December 2022 under extremely good seeing conditions. The solid line shows the upper envelope of the resulting efficiency curves, and the shaded area indicates the standard deviation. The values in the legend show the seeing at the beginning of the first observation and the end of the last observation. The black curve represents the ideal case of 100% coupling limit for seeing of 0.9″ in the YJH-band.