Peak velocity of methanol emission with respect to systemic velocity (from Urquhart et al. 2022) for the 84 GHz (top), 95 GHz (middle), and 104.3 GHz (bottom) lines. The orange filled and purple open histograms represent methanol masers and all methanol detections (including masers and maser candidate), respectively. The black solid and dashed lines depict the Gaussian fitting results for masers and all methanol detection, respectively.