Ortho H2CO(31,2−21,1) and (31,2−21,1) spectra at declination offsets − 30″ (bottom, D-peak), 0″ (middle) and + 30″ (top, P1). The offsets are relative the center position in Fig. 1. The spectra (in colour) have been scaled up with a factor of 10 and appear much more noisy.
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