Averaged simulated stacks used to account for pipeline signal loss in the stack, shown here for COMAP Field 1 above and Field 2 (which is also used for Field 3) below. We show the stacked spectra on the left (averaging across the central 5 × 5 spaxels for presentation purposes) and the stacked images (averaging across the central three spectral channels for presentation purposes) on the right. The apertures over which we sum are shown in black. The spatial and spectral effects of the COMAP analysis pipeline, and the different effects for each field, are visible.