Table 9: Beam averaged column density of various molecules using the disk sizes listed in Table 7.
    $N ({\rm cm}^{-2})$
    LkCa15 TW Hya HD 163296 MWC 480

Species		 Transition $R_{\rm disk}=450$ AU $R_{\rm disk}=165$ AU $R_{\rm disk}=680$ AU $R_{\rm disk}=400$ AU
12COa 13CO $J\!=\!3\!\rightarrow\!2$ 1.9(16) 3.2(16) 3.5(16) 6.9(16)
13CO $J\!=\!3\!\rightarrow\!2$ 3.6(14) 5.5(14) 5.9(14) 1.2(15)
HCO+ $J\!=\!4\!\rightarrow\!3$ 3.3(11) 4.4(12) 9.4(11) 1.0(12)
HCO+ H13CO+ $J\!=\!4\!\rightarrow\!3$ ... 1.2(13) ... ...
H13CO+ $J\!=\!4\!\rightarrow\!3$ <1.5(11) 2.0(11) ... ...
DCO+ $J\!=\!5\!\rightarrow\!4$ <2.9(11) 4.4(11) ... ...
CN $J\!=\!3\frac{7}{2}\!\rightarrow\!2\frac{5}{2}$ 1.5(13) 6.6(13) 1.5(13) 1.5(13)
HCN $J\!=\!4\!\rightarrow\!3$ 1.8(12) 9.2(12) <1.0(12) <1.2(12)
H13CN $J\!=\!4\!\rightarrow\!3$ ... <4.8(11) ... ...
HNC $J\!=\!4\!\rightarrow\!3$ ... <1.4(12) ... ...
DCN $J\!=\!5\!\rightarrow\!4$ ... <4.0(10) ... ...
CS $J\!=\!7\!\rightarrow\!6$ 5.1(12) ... ... ...

H$_{\rm 2}$CO		 $J\!=\!2_{12}\!\rightarrow\!1_{11}$ 5.1(12) ... <2.1(12) <2.7(13)
H$_{\rm 2}$CO $J\!=\!3_{03}\!\rightarrow\!2_{02}$ 1.7(12) ... <2.6(12) ...
H$_{\rm 2}$CO $J\!=\!3_{22}\!\rightarrow\!2_{21}$ <1.4(13) ... <9.4(12) ...
H$_{\rm 2}$CO $J\!=\!3_{12}\!\rightarrow\!2_{11}$ 7.1(11) ... <1.5(12) <9.4(11)
H$_{\rm 2}$CO $J\!=\!5_{15}\!\rightarrow\!4_{14}$ 2.4(12) <8.0(11) <1.1(12) <1.5(12)

CH$_{\rm 3}$OH		 $J\!=\!2_K\!\rightarrow\!1_K$ <7.1(13) ... <2.8(13) ...
CH$_{\rm 3}$OH $J\!=\!4_{\rm 2}\!\rightarrow\!3_1$ E+ <4.3(14) ... ... <6.9(13)
CH$_{\rm 3}$OH $J\!=\!5_K\!\rightarrow\!4_K$ <2.4(13) ... ... ...
CH$_{\rm 3}$OH $J\!=\!7_K\!\rightarrow\!6_K$ ... <1.1(13) ... ...

N$_{\rm 2}$H+		 $J\!=\!4\!\rightarrow\!3$ <1.4(12) <1.0(13) ... <1.5(12)
H$_{\rm 2}$D+ $J\!=\!1_{10}\!\rightarrow\!1_{11}$ <8.7(11) <4.4(12) ... <1.0(12)

SO		 $J\!=\!8_8\!\rightarrow\!7_7$ ... <4.3(12) ... ...
Note. The excitation temperature is assumed to be 25 K for all lines; uncertainties in the column densities
are of the order of 30%, not including uncertainties in the disk size.
a(b) means a $\times$ 10b.
a 12CO column density derived from 13CO intensity assuming [12C]/[13C] = 60.

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