Example of an up-the-ramp readout for MACC(3,8,4) with 3 groups, 8 reads, and 4 drops, with true flux indicated in black, readout values in red and estimated flux in green. The flux error in this illustration largely stems from a comparatively high readout noise of 12 e⁻relative to a flux of 3 e⁻/frame. Group average charges G_i are here indicated by horizontal lines for each group as well as on the right y-axis. The actual NISP-P readout mode is MACC(4,16,4) while for NISP-S it is MACC(15,16,11) and the nominal frame rate is 1.45s.