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Table 2

Gas mass derived from various tracers.

Tracer Gas phase Mass (106 M)
2.6 mm line H2 1.8
Free–free intensity (ne = 2 cm−3) H ii 1.0/5.5
Free–free intensity (ne = 10 cm−3) H ii 0.2/1.1

Notes. The lower and upper limits (in the region of RCW 49 or including also the region of G287.393–00.630) are indicated in the case of the free–freeintensity tracer.

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