Table 5: Model parameters.

Model		 Component 1 Component 2 Relative
  Kinetic Gas CO column Kinetic Gas CO column J=2-1 $~{\rm ^{12}CO}$
  temperature density density temperature density density emission
  $T_{\rm k}$ $n(~{\rm H_{2}}$) N(CO)/dV $T_{\rm k}$ $n(~{\rm H_{2}}$) N(CO)/dV component
  (K) ( $~{\rm cm^{-3}}$) ( $~{\rm cm^{-2}}\ (~{\rm {km~s^{-1}}})^{-1}$) (K) ( $~{\rm cm^{-3}}$) ( $~{\rm cm^{-2}}\ (~{\rm {km~s^{-1}}})^{-1}$) 1:2

1 (Center)		 100 100 $1.0\times10^{17}$ 60 1000 $3.0\times10^{17}$ 0.65:0.35
2 (Center) 150 1000 $0.6\times10^{17}$ 20 3000 $3.0\times10^{17}$ 0.55:0.45
3 (Arm) 100 100 $1.0\times10^{17}$ 150 1000 $3.0\times10^{17}$ 0.80:0.20


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