Table 6: Integrated line intensities.
              $\int \ T_{{\rm mb}}\ {\rm d}v\ ({\rm K\ km \ s}^{-1})$

Line		 $E_{\rm upper}$ $n_{\rm crit}^a$ $\nu$ Telescope Beam Cal.d LkCa15 TW Hya HD 163296 MWC 480
  (K) (cm-3) (GHz)   ( $^{\prime\prime}$)          

12CO $J\!=\!2\!\rightarrow\!1$		 16.6 2.7(3) 230.538 IRAM30 m 10.7 ... 1.82 ... ... ...
12CO $J\!=\!3\!\rightarrow\!2$ 33.2 8.4(3) 345.796 JCMT 13.7 yes 1.17 1.98 3.78 2.88
13CO $J\!=\!3\!\rightarrow\!2$ 31.7 8.4(3) 330.587 JCMT 14.3 yes 0.39 0.24 0.94 0.57
C18O $J\!=\!2\!\rightarrow\!1$ 15.8 2.7(3) 219.560 JCMT 21.5 yes <0.20 ... ... ...
C18O $J\!=\!3\!\rightarrow\!2$ 31.6 8.4(3) 329.330 JCMT 14.3 yes <0.14 ... ... ...

HCO+ $J\!=\!4\!\rightarrow\!3$		 42.8 1.8(6) 356.734 JCMT 13.2 yes 0.26 1.26 1.10 0.35
H13CO+ $J\!=\!4\!\rightarrow\!3$ 41.6 1.8(6) 346.998 JCMT 13.6 yes <0.13 0.07 ... ...
DCO+ $J\!=\!5\!\rightarrow\!4$ 51.8 3.0(6) 360.169 JCMT 13.1 yes <0.10 0.11 ... ...
CN $J\!=\!3\frac{7}{2}\!\rightarrow\!2\frac{5}{2}$ 32.7 6.0(6) 340.248 JCMT 13.9 no 0.67 1.14 0.95 0.29
HCN $J\!=\!4\!\rightarrow\!3$ 42.5 8.5(6) 354.506 JCMT 13.3 yes 0.25 0.49 <0.20 <0.07
H13CN $J\!=\!4\!\rightarrow\!3$ 41.4 8.5(6) 345.339 JCMT 13.6 no ... <0.04 ... ...
HNC $J\!=\!4\!\rightarrow\!3$ 43.5 8.5(6) 362.630 JCMT 13.0 no ... <0.05 ... ...
DCN $J\!=\!5\!\rightarrow\!4$ 52.1 4.8(7)b 362.046 JCMT 13.0 yes ... <0.03 ... ...
CS $J\!=\!7\!\rightarrow\!6$ 65.8 2.9(6) 342.883 JCMT 14.0 no <0.08 ... ... <0.08
SO $J\!=\!8_8\!\rightarrow\!7_7$ 87.7 1.8(6) 344.310 JCMT 13.7 no ... <0.10 ... ...

H$_{\rm 2}$CO $J\!=\!2_{12}\!\rightarrow\!1_{11}$		 21.9 1.0(5) 140.839 IRAM30 m 17.5 ... 0.17 ... <0.10 <0.40
H$_{\rm 2}$CO $J\!=\!3_{03}\!\rightarrow\!2_{02}$ 21.0 4.7(5) 218.222 IRAM30 m 11.3 ... 0.14 ... <0.30 ...
H$_{\rm 2}$CO $J\!=\!3_{22}\!\rightarrow\!2_{21}$ 68.1 2.3(5) 218.475 IRAM30 m 11.3 ... <0.10 ... ... <0.06
H$_{\rm 2}$CO $J\!=\!3_{12}\!\rightarrow\!2_{11}$ 33.5 4.5(5) 225.697 IRAM30 m 10.9 ... 0.10 ... <0.30 ...
H$_{\rm 2}$CO $J\!=\!3_{12}\!\rightarrow\!2_{11}$ 33.5 4.5(5) 225.697 JCMT 22.2 no ... <0.05 ... ...
H$_{\rm 2}$CO $J\!=\!5_{15}\!\rightarrow\!4_{14}$ 62.5 1.7(6) 351.768 JCMT 13.4 yes 0.29 <0.04 <0.20 <0.09

CH$_{\rm 3}$OH $J\!=\!2_K\!\rightarrow\!1_K$		 6.9 2.6(3)c 96.741 IRAM-30 m 25.4 ... <0.05 ... <0.03 ...
CH$_{\rm 3}$OH $J\!=\!4_{\rm 2}\!\rightarrow\!3_1$ E+ 45.4 3.7(4) 218.440 IRAM30 m 11.3 ... <0.10 ... ... <0.20
CH$_{\rm 3}$OH $J\!=\!5_K\!\rightarrow\!4_K$ 34.8 4.5(4) 241.791 IRAM30 m 10.2 ... <0.10 ... <0.10 ...
CH$_{\rm 3}$OH $J\!=\!7_K\!\rightarrow\!6_K$ 65.0 1.3(5) 338.409 JCMT 13.9 yes ... <0.02 ... ...

N$_{\rm 2}$H+ $J\!=\!4\!\rightarrow\!3$		 44.7 4.4(6) 372.672 JCMT 12.7 no <0.10 <0.30 ... <0.05
H$_{\rm 2}$D+ $J\!=\!1_{10}\!\rightarrow\!1_{11}$ 104.3 1.2(6) 372.421 JCMT 12.7 no <0.10 <0.20 ... <0.05
Note. The dots indicate not observed. When a line is not detected, a 2$\sigma$ upper limit on $T_{\rm mb}$ in a 0.3 km s-1 bin is computed and the same profile as the 13CO $J\!=\!3\!\rightarrow\!2$ line is assumed. The beam size ( HPBW) is computed for the IRAM-30 m using the fitting formula ${\it HPBW}(\hbox{$^{\prime\prime}$ })=2460$/frequency(GHz). a Unless specified, the critical densities are taken from Jansen (1995) for $T_{\rm kin}=100$ K assuming optically thin lines. a(b) means a $\times$ 10b. b Computed using the collisional rate coefficients for HCN. c Derived assuming the collisional rate coefficients of Peng & Whiteoak (1993). d Observation of calibration sources before and/or after the object. More details are given in Table 5.

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