Matched filter response across the spectral windows containing methanol (CH₃OH) transitions using a Keplerian mask with a radius of 50 au (top) and the remaining spectral windows with a mask of radius 100 au (bottom). Rest frequencies of the labeled transitions are marked with vertical dashes. See J. Terwisscha van Scheltinga et al. (2021) for an analysis of the H₂CO emission.