Combination of RADEX models scaled to fit the S 106 12CO ladder. The low density component with log n = 4, T = 300 K is represented by the green line, while the dominant contribution arises from the dense component with log n = 5.6 and a temperature of 400 K which is represented by the purple line. The aggregate model (black line) matches the observed 12CO ladder from JU = 4 to 20.
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