Table 3: Central CO and CI line intensities in M 51.

Transition		 Resolution $T_{\rm mb}$ $\int T_{\rm mb}$dV $T_{\rm mb}$ $\int T_{\rm mb}$dV
    ( $\hbox{$^{\prime\prime}$ }$) (mK) ( $~{\rm {K~km ~s^{-1}}}$) (mK) ( $~{\rm {K~km ~s^{-1}}}$)
      Position A: Position B:
      Center NW Arm GMA-1

$~{\rm ^{12}CO}$		 J=2-1 21 260 $38.8\pm8.5$ 805 $54.0\pm7.5$
    43 - $44.5\pm9.0$ - $36.0\pm7.2$
$~{\rm ^{13}CO}$   21 - - 77 $7.5\pm1.0$
$~{\rm ^{12}CO}$ J=3-2 14 375 $42.7\pm6.5$ 1535 $64.5\pm9.5$
    21 - $30.2\pm6.0$ - $55.0\pm9.5$
$~{\rm ^{13}CO}$   14 28 $3.3\pm0.7$ 43 $5.5\pm1.5$
$~{\rm ^{12}CO}$ J=4-3 11 160 $27.0\pm4.5$ 520 $52.5\pm7.5$
    14 - $23.0\pm4.5$ - $33.0\pm7.0$
    21 - $19.0\pm3.8$ - $24.0\pm4.0$

[CI]		 3P1-3P0 10 - - 565 $28\pm5$
    21 - - - $(13\pm4)$
Note: Position A: beam centered on nucleus; Position B: beam centered on Giant Molecular Association 1 in NW spiral arm at offsets $\Delta\alpha = -10''$, $\Delta\delta=+15''$ with respect to the nucleus.

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