Three regions of a CRIRES+ K-band spectrum of MASCARA-1, showing the general agreement between different extraction methods. The black line is a spectrum extracted using the ExoRES pipeline, while the three other spectra are extracted using the CR2RES pipeline. Here we varied the swath width between 400, 800, and 1600 pixels, shown in blue, orange, and green, respectively. Depending on the swath width, some regions show a varying continuum level and even some spiky artifacts, as can be mainly seen on the right in the top panel. Note that the narrow spectral lines in the middle panel appear slightly deeper in the CR2RES pipeline, while the opposite is true for the saturated lines in the bottom panel.