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Table 5

Optical depth, τ, of H2D+ and N2H+ estimated with RATRAN at the central position of each core.

Core Species τ (QE-BES) τ (LP) τ (Static) τ (SIS)
L183 H2D+ 110–111 0.4 0.4 0.4 3.6
L694-2 H2D+ 110–111 0.7 0.2 0.3 0.4
L1517B H2D+ 110–111 0.1 0.05 0.08 0.8
L1544 H2D+ 110–111 1.5 0.4 0.4 0.2
N2H+ 4–3 1.6 0.5 0.5 0.2
L1521f H2D+ 110–111 0.08 0.07 0.08 0.02
N2H+ 4–3 0.7 0.3 0.6 0.5

Notes. The optical depth, τ, at the central position of each core is found to be <1 for both species for most models.

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