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Fig. 2

image

Intensity maps ( scale; color bar in units of K km s-1) of para-H2CO 303–202 (left), 322–221 (middle), and 321–220 (right) integrated from VLSR = 4 to 14 km s-1 of the OMC-1 cloud. Contour levels are from 1.9 to 19 K km s-1 with steps of 1.9 K km s-1 and from 19 to 95 K km s-1 with steps of 9.5 K km s-1 for para-H2CO 303–202, and from 1.05 to 10.5 K km s-1 with steps of 1.05 K km s-1 and from 10.5 to 52.5 K km s-1 with steps of 5.25 K km s-1 for para-H2CO 322–221 and 321–220.

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