Water abundance variations around high-mass protostars: HIFI observations of the DR21 region | A&A

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Table 1:

Abundances and column densities of ¹³CO and H₂O.
Component	N(¹³CO)^a	N(p-H₂O)	N(H₂)	x(p-H₂O)
	10¹⁶ cm^-2	10¹² cm^-2	10²¹ cm^-2
Dense core	$7.8\times10^{-7}$	...	...	$1.6\times10^{-10}$
Outflow	5	10 000	15	$7\times10^{-7}$
Foreground	0.7	4	2.1	$4\times10^{-9}$

Notes. ^(a) Abundance for the dense core.

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