Detected trans-HCOOH rotational lines towards the edge of the Bar, (+10′′, –10′′) position. The ordinate refers to the intensity scale in main beam temperature units, and the abscissa to the LSR velocity. Line frequencies (in GHz) are indicated at the top-right of each panel together with the rotational quantum numbers (in blue). The red curve shows an excitation model that reproduces the observations. Cis-HCOOH lines are shown in Fig. 2.
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