Table 5: Calibration sources used for the JCMT observations.

Line		 LkCa15 TW Hya HD 163296 MWC 480

12CO $J\!=\!3\!\rightarrow\!2$		 N2071 IR N2071 IR IRC+10216 W3(OH)
    IRC+10216 IRAS16293-2422  
13CO $J\!=\!3\!\rightarrow\!2$ W3(OH) IRC+10216 NGC6334I W3(OH)
      G34.3  
      IRAS16293-2422  
C18O $J\!=\!2\!\rightarrow\!1$ CRL618 ... ... ...
C18O $J\!=\!3\!\rightarrow\!2$ W3(OH) ... ... ...
        N1333IR4
HCO+ $J\!=\!4\!\rightarrow\!3$ W3(OH) N2071 IR G34.3 W3(OH)
H13CO+ $J\!=\!4\!\rightarrow\!3$ IRC+10216 IRC+10216 ... ...
    N2071 IR    
DCO+ $J\!=\!5\!\rightarrow\!4$ N1333IR4 IRAS16293-2422 ... ...
  IRC+10216      
CN $J\!=\!3\frac{7}{2}\!\rightarrow\!2\frac{5}{2}$ CRL618 CRL618 CRL618 CRL618
      IRAS16293-2422 G34.3
HCN $J\!=\!4\!\rightarrow\!3$ CRL618 IRC+10216 IRAS16293-2422 W3(OH)
        CRL618
        OMC1
HNC $J\!=\!4\!\rightarrow\!3$ ... N2071 IR ... ...
DCN $J\!=\!5\!\rightarrow\!4$ ... N2071 IR ... ...
    IRC+10216    
H13CN $J\!=\!4\!\rightarrow\!3$ not available ... ... ...
    IRAS16293-2422    
CS $J\!=\!7\!\rightarrow\!6$ not observed ... ... not observed
SO $J\!=\!8_8\!\rightarrow\!7_7$ ... ... ... ...
H$_{\rm 2}$CO $J\!=\!3_{12}\!\rightarrow\!2_{11}$ ... N2071 IR ... ...
H$_{\rm 2}$CO $J\!=\!5_{15}\!\rightarrow\!4_{14}$ CRL618 N2071 IR IRAS16293-2422 CRL618
    IRC+10216    
CH$_{\rm 3}$OH $J\!=\!7_K\!\rightarrow\!6_K$ ... not observed ... ...
N$_{\rm 2}$H+ $J\!=\!4\!\rightarrow\!3$ not available not available ... not available
H$_{\rm 2}$D+ $J\!=\!1_{10}\!\rightarrow\!1_{11}$ not available not available ... not avaialble
Note. When a observation is carried out over more than one run, different standard sources are used depending on their availability. The entry ... indicates that the source was not observed in that particular line (cf. Table 6), so no standard was needed.


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