Fig. 4
Theoretical N(J = 1)/N(J = 0) ratio on the ν′′ = 0 vibrational level from Eq. (6) shown as a dark blue dashed line. The light blue dashed lines represent errors introduced by the uncertainty of the Northo/Npara H2 ratio 0.64 ± 0.21. The observed N(1)/N(0) ratio is plotted as a straight black line. The N(1)/N(0) uncertainties are shown as straight gray lines.
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