Integrated line flux of the 312 − 211 line of H2CO vs that of the 313 − 212 transition. Color codes indicate detected vs. non-detected lines: blue for detection of both lines, black for detection of the 313 − 212 line, green for non detections. The detection threshold is set at 4σ. For detected lines, the errorbars are 1σ. For non-detected lines, the limit is the 2σ value, and the arrow length is 1σ. Sources in italics are those with known molecular outflows.
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