Table 4: Current values for all the models and observed values as reported in Boissier & Prantzos (1999) and Chiappini et al. (2001).
         
Model Gas Stars $\frac{\Sigma_{\rm gas}}{\Sigma_{\rm tot}}$ Total
  [ $M_{\odot}~{\rm pc}^{-2}$] [ $M_{\odot}~{\rm pc}^{-2}$]   [ $M_{\odot}~{\rm pc}^{-2}$]
1 7.00 35.24 0.1444 48.46
2 10.11 35.09 0.2024 49.98
3 7.42 38.66 0.1431 51.88
4 7.00 35.24 0.1444 48.46
5 6.99 36.13 0.1439 48.55
6 7.06 35.60 0.1455 48.53
7 7.00 36.69 0.1442 48.56
8 9.21 34.75 0.2056 48.55
9 7.06 36.32 0.1455 48.55
10 10.29 34.29 0.2099 49.04
Boissier & Prantzos (1999) 13 $\pm$ 3 35 $\pm$ 5 0.15-0.25 51 $\pm$ 6
Chiappini et al. (2001) 7.0 36.3 0.13 53.85

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