Evolution of the retrieved S/N of the injected signal with the number of SYSREM iterations for the 1.0 μm band (left), 1.15 μm band (middle), and 1.4 μm band (right). The model is injected at 5× the nominal strength. For the spectral orders where a very small signal is retrieved (i.e., S∕N < 3), we injected astronger model at 10× (for orders 49 and 38) and at 12× (for order 60) the nominal strength so as to ensure the injected signal is clearly measured (i.e., S∕N ≥ 3). The stars represent the selected number of iterations for each spectral order at the peak of the recovered S/N (see text).