Noise-free (top) and noisy (bottom) template matches to the mock spectrum shown in Figure A.1. The top panel of Figure A.1 shows the same as the bottom panel of this figure. The red curve shows the FELIS template match to the part of the spectrum in black (within the vertical dotted lines). The green curve shows the template match before applying the flux scaling. The part of the mock spectrum outside the considered wavelength range is marked in gray.