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Table 5:

Power-law relations and correlation coefficients $r_{\rm c}$ between dust extinction and gas components.

X 		Y R        $a_{\rm c}$        b n        $r_{\rm c}$ t
(1018 at cm-2) (mag) ( $\hbox {$^\prime $ }$)          
N(2H2) $A_{\rm H\alpha}$ 0-30 -1.88 $\pm$ 0.06 0.53 $\pm$ 0.03 207 0.60 $\pm$ 0.06 11
    30-50 -1.83 $\pm$ 0.04 0.52 $\pm$ 0.02 610 0.64 $\pm$ 0.03 20
    0-50 -1.85 $\pm$ 0.03 0.52 $\pm$ 0.01 817 0.63 $\pm$ 0.03 23

N(HI)

 A $_{\rm H\alpha }$ 0-30 -3.29 $\pm$ 0.11 0.94 $\pm$ 0.04 354 0.69$\pm$0.04 18
    30-50 -3.26 $\pm$ 0.07 0.84 $\pm$ 0.02 768 0.72 $\pm$ 0.03 29
               
N(gas) A $_{\rm H\alpha }$ 0-30 -2.97 $\pm$ 0.08 0.79 $\pm$ 0.03 350 0.80 $\pm$ 0.03 25
    30-50 -3.05 $\pm$ 0.06 0.76 $\pm$ 0.02 766 0.77 $\pm$ 0.02 33

Notes. Ordinary least-squares fits of bisector log (Y) =  $a_{\rm c}+b$ log (X) through n pairs of (log X, log Y), where n is the number of independent points (Isobe et al. 1990); t is the student-t test.


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