Table 1: H2 column density toward HD 100546 and HD 163296.
HD 100546   HD 163296
J v log $N_{\rm H_2}$ $^{\rm a}$   J v log $N_{\rm H_2}$ $^{\rm a}$
    (cm-2)       (cm-2)
0 0 $\rm 15.16^{+0.38}_{-0.26}$   0 0 $\rm 17.1^{+0.4}_{-0.7}$
1 0 $\rm 16.00^{+0.28}_{-0.19}$   1 0 $\rm 17.9^{+0.2}_{-0.3}$
2 0 $\rm 15.58^{+0.28}_{-0.21}$   2 0 $\rm 17.4^{+0.4}_{-1.0}$
3 0 $\rm 15.83^{+0.21}_{-0.11}$   3 0 $\rm 17.4^{+0.2}_{-0.3}$
4 0 $\rm 15.13^{+0.07}_{-0.07}$   4 0 $\rm 16.4^{+0.4}_{-0.8}$
5 0 $\rm 15.51^{+0.08}_{-0.06}$        
6 0 $\rm 14.69^{+0.11}_{-0.10}$        
7 0 $\rm 14.87^{+0.10}_{-0.08}$        
8 0 $\rm 13.89^{+0.18}_{-0.25}$        
9 0 $\rm 14.31^{+0.08}_{-0.07}$        
10 0 $\rm 13.47^{+0.25}_{-0.55}$ (3$\sigma$ detection)      

1		 1 $\rm 13.87^{+0.05}_{-0.06}$        
2 1 $\rm 13.45^{+0.09}_{-0.11}$        
3 1 $\rm 13.91^{+0.04}_{-0.04}$        
4 1 $\rm 13.33^{+0.07}_{-0.09}$        
5 1 $\rm 13.89^{+0.08}_{-0.08}$        

$^{\rm a}$ The error bars are 2$-\sigma$ error bars.

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