Left panels: sections of the order 35, from Night 1, shown at various stages of post-processing, demonstrating the removal of the stellar residuals. Right panels: sections of frame 38 from order 35, demonstrating the removal of the stellar residuals from a single spectrum. Row 1: observed spectra after bad pixel correction and alignment to the true stellar rest frame; row 2: after the removal of each order’s continuum; row 3: after division by a master spectrum; row 4: after masking the columns with over 1.4× the mean column variance, followed by one iteration of the  SYSREM algorithm; row 5: after weighting columns by their variance; bottom row: same stage as for Row 5, but with a model planet (R_p = 1.9R_J, A_g = 0.5, v_{refl, mod} = 0.0 km s⁻¹) injected at 100× nominal strength after the alignment to the stellar rest frame. At each stage of post-processing, the standard deviation of the entireorder decreases.