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Table 4:

Measured central 12CO and 13CO line intensities.
  Beam NGC 278 NGC 660 NGC 3628 NGC 4631 NGC 4666
  size $T_{\rm mb}$ $\int T_{\rm mb}$dV $T_{\rm mb}$ $\int T_{\rm mb}$dV $T_{\rm mb}$ $\int T_{\rm mb}$dV $T_{\rm mb}$ $\int T_{\rm mb}$dV $T_{\rm mb}$ $\int T_{\rm mb}$dV
  ( $\hbox{$^{\prime\prime}$ }$) (mK) ( $~{\rm {K~km~s^{-1}}}$) (mK) ( $~{\rm {K~km~s^{-1}}}$) (mK) ( $~{\rm {K~km~s^{-1}}}$) (mK) ( $~{\rm {K~km~s^{-1}}}$) (mK) ( $~{\rm {K~km~s^{-1}}}$)
$~{\rm ^{12}CO}$                      
J=1-0 22 595 21 $\pm$ 2 635 163 $\pm$ 16 980 211 $\pm$ 25 550 45 $\pm$ 6 395 77 $\pm$ 9
J=2-1 12 755 26 $\pm$ 3 1377 352 $\pm$ 35 1420 207 $\pm$ 25 600 45 $\pm$ 6 505 74 $\pm$ 9
  21 393 16 $\pm$ 2 516 137 $\pm$ 14 710 151 $\pm$ 18 390 26 $\pm$ 3 320 54 $\pm$ 6
  43 -- 14 $\pm$ 2 -- 62 $\pm$ 8 -- 71 $\pm$ 9 -- 21 $\pm$ 3 -- 27 $\pm$ 3
J=3-2 14 414 15 $\pm$ 2 490 164 $\pm$ 19 860 163 $\pm$ 20 280 22 $\pm$ 3 315 51 $\pm$ 6
  21 -- 13 $\pm$ 2 -- 94 $\pm$ 11 -- 130 $\pm$ 15 -- 17 $\pm$ 2 -- 37 $\pm$ 4
J=4-3 11 310 15 $\pm$ 2 565 161 $\pm$ 16 930 176 $\pm$ 21 250 19 $\pm$ 2 150 28 $\pm$ 5
  14 -- 11 $\pm$ 1 -- 122 $\pm$ 14 -- 140 $\pm$ 17 -- 14 $\pm$ 2 -- 23 $\pm$ 3
  21 -- $\pm$ 1 -- 92 $\pm$ 11 -- 98 $\pm$ 12 -- -- -- 16 $\pm$ 2
$~{\rm ^{13}CO}$                      
J=1-0 21 68 2.5 $\pm$ 0.3 34 10.4 $\pm$ 1 72 17.1 $\pm$ 2.0 40 3.45 $\pm$ 0.38 40 8.8 $\pm$ 1.0
J=2-1 12 64 2.7 $\pm$ 0.3 66 18.7 $\pm$ 2 82 20.9 $\pm$ 2.5 60 3.75 $\pm$ 0.45 40 11.3 $\pm$ 1.3
  21 77 1.9 $\pm$ 0.3 44 11.4 $\pm$ 1 46 13.6 $\pm$ 1.7 20 1.20 $\pm$ 0.14 30 8.1 $\pm$ 0.8
J=3-2 14 55 1.3 $\pm$ 0.2 32 12.9 $\pm$ 1 77 20.6 $\pm$ 2.5 -- -- 25 4.5 $\pm$ 0.6

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