Population diagram for H2CO. We show the results from the fits of the rotational ladders Ka = 0 (red), Ka = 1 (blue), and Ka = 2 (green). For the Ka = 3 (pink) we adopted as rotational temperature the average of the rotational temperatures of the Ka = 0, 1, and 2 ladders to estimate a rough value for the Ka = 3 column density.
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