Correlations between the ratio of CO and [O I] line luminosities and bolometric luminosity of YSOs in the two cores in Gy 3–7 (gray diamonds), Class 0 and Class I YSOs (orange ‘×’ signs and red circles, respectively; Karska et al. 2018), IM YSOs (blue circles; Matuszak et al. 2015), and HM YSOs (green squares; Karska et al. 2014a). The bolometric luminosities for Gy 3–7 cores are adopted from Elia et al. (2021). The top panel shows a power-law fit to all individual data points, and the bottom panel shows the fit to the data bins (both shown as black dashed line).