Signal-to-noise ratio as a function of contrast (Δm) and log-scaled separation for HiRISE without a coronagraph (blue lines), with an APLC (orange lines), and with a CLC (green lines). The simulation is performed for a HIP 65426-like host star with a 1200 K planet and 2 h of integration time. S/N values below the inner working angle radius of 92.5 mas have been suppressed for the two modes using the focal plane mask. The S/N is computed with a matched filtering approach (see Sect. 3.1) comparing the simulated spectra with the noiseless input planet spectrum. The known planet HIP 65246 b is indicated by a blue box.