CO 3−2 spectra with selected integration limits indicated, except for Ced110 IRS4, BHR71, and DK Cha where CO 6−5 was used. Each panel presents these limits for each source. The black spectrum at the bottom is taken from a clean position representative for the envelope emission. The blue spectrum at the middle is the representative spectrum from the blue outflow lobe, and red spectrum at the top is the representative spectrum from the red outflow lobe. Each panel shows five vertical lines, these are V_LSR (black dashed line), V_out,blue (dot-dash blue line), V_in,blue (dashed blue line), V_in,red (dashed red line), and V_out,red (dot-dash red line).

Each row contains contour and integrated intensity maps (in K km s^-1) of sources in ¹²CO 6−5 and 3−2. The contour levels and integration limits are given in Table A.1 and integration limits shown in Fig. A.1. The color images show all emission integrated from V_out,red to V_out,blue, including any minor cloud contribution.

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¹³CO 6−5 and 3−2 integrated intensity maps of the sources (in K km s^-1).

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Correlations between F_CO as measured from CO 3−2 and bolometric luminosity, envelope mass and outflow mass as determined from CO 3−2.

7 × 7 pixel fully sampled maps are extracted toward the central positions of the sources in ¹³CO 6−5 (left) and in ¹²CO 6−5 (middle) transitions. The axes represent the equatorial offsets (Δα, Δδ) in arcsec. The main beam temperature intensity scale of each box are shown in the y-axes of the bottom-left box in Kelvins. The velocity range in each box is ±8 km s^-1 for the ¹³CO spectra, and ±25 km s^-1 for the ¹²CO spectra. The red lines in the left-hand panels are the ¹³CO 6−5 model line intensities for the passively heated envelope. The excess emission in the observations compared with these model profiles corresponds to the UV-heated gas and is shown as an image in the right panel with the intensity scale in K km s^-1. The middle and right panels contain the red and blue outflow lobes with the contour levels given in Table A.1. The blue and red arrows in the right-hand panels show the direction of the outflow lobes.

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Same as Fig. A.5. ¹²CO 6−5 transitions were not observed for L1448MM and L1551 IRS5 in our observing campaign, therefore left blank.

¹³CO 3−2/6−5 intensity ratio as a function of density and gas temperature calculated via RADEX for N(¹³CO) = 1.5 × 10¹⁴ cm^-2. Red markers indicate the observed intensity ratios for the central pixels for Class 0 sources whereas blue markers are for Class I sources. Both pixels are taken to be 15″ diameter. The corresponding densities are the values at the 7.5″ radius found in the power-law envelope models of Kristensen et al. (2012).