Prestellar and protostellar cores in Orion B9

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Table 9:

Parameters derived in Sect. 4.4.
Source	$x({\rm H_2D^+})$	$x({\rm H_3^+})$	$x({\rm e})_l$ ^a	$x({\rm e})_u$	$\langle x({\rm e}) \rangle$ ^b	$\zeta_{\rm H_2}$ ^c	C_i
	[10^-9]	[10^-8]	[10^-8]	[10^-7]	[10^-7]	[10^-16 s^-1]	[10³ cm^-3/2 s^1/2]
Ori B9 E	2.0	1.8	2.0/3.0	6.4	3.4	2.0/1.0	2.6
Ori B9 N	1.0	0.9	1.0/2.0	6.3	3.3	2.5/1.3	4.1

^a The first value is calculated from Eq. (7), whereas the second value is calculated from Eq. (9). ^b This is the mean value between the lower and upper limit, where $x({\rm e})_l$ is calculated from Eq. (9). ^c The second value is derived by including HCO⁺ in the analysis (see text).

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