Expected overall throughput of NIRPS instruments for HA mode and different I magnitude for a 0.9″ seeing. The dark blue, green, and orange curves correspond to the overall throughput for I of 10, 11 and 12, respectively. The dashed curve represents the atmospheric absorption bands on top of the overall throughput computed for I = 10. The dotted curve shows the 100% coupling into the HA fibre. The blue curve corresponds to the overall predicted throughput for the HE mode for targets brighter than I=9.