Rotational population diagrams from the observed HCOOH lines towards the Orion Bar, (+10′′, –10′′) position. Left: diagram for the cis conformer (measurements lie along a single component). Right: diagram for the trans conformer showing how different Ka rotational ladders split in different components. Fitted values of the rotational temperature, Trot, and column density, N, are indicated in each panel (see also Table C.1).
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