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Table 2

Model cloud parameters fits for pixels of increasing distance R (in kpc) from the center of the galaxy.

R log 10 [n] log 10 [G] log 10mech] A V

< 0.4 mPDR 1.9 ± 0.2 − 0.6 ± 1.9 − 23.0 ± 0.2 12.2 ± 0.4 1.7 ± 0.5
Actual 1.9 ± 0.2 1.8 ± 0.1 − 23.4 ± 0.2 11.2 ± 1.3

~ 0.8 mPDR 1.9 ± 0.3 1.4 ± 3.0 − 23.1 ± 0.3 12.8 ± 2.3 1.3 ± 0.2
Actual 1.8 ± 0.1 1.7 ± 0.1 − 23.3 ± 0.1 9.4 ± 1.1

~ 1.0 mPDR 1.9 ± 0.2 2.0 ± 2.3 − 23.1 ± 0.1 12.0 ± 4.4 1.6 ± 0.2
Actual 1.7 ± 0.1 1.7 ± 0.1 − 23.3 ± 0.1 8.5 ± 0.6

~ 1.5 mPDR 1.7 ± 0.4 0.4 ± 2.0 − 23.3 ± 0.1 8.2 ± 1.3 1.0 ± 0.1
Actual 1.5 ± 0.1 1.3 ± 0.1 − 23.7 ± 0.1 5.5 ± 0.4

Notes. These parameters are n (in cm-3 ), G (in units of G0), Γmech  (in erg cm-3 s-1 ) and AV (in mag). The values in the row (mPDR) correspond to the average fit parameters and the dispersion for pixels at a distance R from the center. The actual mean values of the cloud parameters are listed in the following row labeled “Actual”. We use 51 transitions in these fits and minimize the by varying four parameters, thus the DOF of the fit are 51–4 = 47. In the last column we show the mean value of , which is the value of the χ2 per degree of freedom minimizing the fits. Smaller imply better fits but not necessarily good estimates of the actual values of the cloud parameters.

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