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Table 3:

Derived column densities for HOCN and HCNO, and abundance ratios.

Source 		N (HOCN) HOCN/H2a N (HCNO) HCNO/H2a n(H2) HNCO/HOCN HNCO/HCNO HCNO/HOCN
  1010 cm-2 $\times10^{13}$ 1010 cm-2 $\times10^{13}$ 105 cm-3      

B1-b 		14.3(6)/10(1) 11/7.7 21(1)/17(4)b 16/13 20(5) 62/80 42/47 1.5/1.7
L1527 3.8(5)/2.7(2) 13/9.0 6(1)/4(1)b 21/15 5(1)b 58/67 34/40 1.7/1.7
L1527-B $\leq$1/1.5 $\leq$3.3/5.0 5(1)/4(1)b 17/13 5(1)b $\geq$90/53 18/20 $\geq$5/2.7
L1544 9(1)/8.6(2) 6.9/6.6 6(3)/6(2)b 4.6/4.8 0.7(2)b 59/48 88/65 0.7/0.7
L183 7(3)/4.0(2) 88/53 6(2)/5(1)b 75/66 5(1) 51/63 60/50 0.8/1.2
TMC-1 $\leq$0.9/1.9 $\leq$9/19 $\leq$1.3/1.4b $\leq$13/14 0.3(1)b      
IRAS 16293-2422 125(4)/160(1) 3.6/ 4.6 $\leq$115/60 $\leq$3.3/1.7 2.5(5) 27/21 $\geq$30/57 $\leq$0.9/0.4

SgrB2M-B

 2600c $\approx$260 $\leq$17 $\leq$1.7 $\approx$1.4a 181 $\geq$30000 $\leq$0.006
SgrB2M h.c. 70000c $\approx$260 $\leq$5818 $\leq$22 $\approx$750a 90 $\geq$1031 $\leq$0.083
SgrB2M ext. 750c $\approx$75 $\leq$14 $\leq$1.4 $\approx$1.4a 230 $\geq$12143 $\leq$0.019
SgrB2N h.c. 670000c $\approx$5200 $\leq$79139 $\leq$609 $\approx$540a 313 $\geq$2654 $\leq$0.118
SgrB2N ext. 1600c $\approx$160 $\leq$45 $\leq$4.5 $\approx$1.4a 181 $\geq$6444 $\leq$0.028
SgrB2S 4200c $\approx$420 $\leq$40 $\leq$4.0 $\approx$1.4a 43 >4500 <0.010

Notes. L1527-B corresponds to the position (20'', -20'') of this source, and SgrB2M-B to the offset (20'', 100'') with respect to SgrB2M, h.c. refers to a hot core component, and ext. to the extended gas around this hot core. The first entry in the N(HOCN), N(HCNO) values, and in the abundances ratios corresponds to the column density obtained from the rotational diagrams, while the second one corresponds to the same parameter obtained from the LVG calculations. Column densities in cold cores for HNCO are from Marcelino et al. (2009), and those for the GC clouds from Brünken et al. (2010). For IRAS 16293-2422 we have assumed $N({\rm HNCO})=3.4\times10^{13}$ (van Dishoeck et al. 1995). a Assumed H2 column densities are: B1-b: $1.3\times10^{23}$ cm-2 (Hirano et al. 1999); L1527: $3\times10^{22}$ cm-2 (Jørgensen et al. 2002); L1544: $1.3\times10^{23}$ cm-2 (Ward-Thompson et al. 1999); L183: $7.6\times10^{21}$ cm-2 (Swade 1989); TMC-1(CP): $1\times10^{22}$ cm-2 (Cernicharo & Guélin 1987); IRAS 16293-2422: $3.5\times10^{24}$ cm-2 (Bottinelli et al. 2004); SgrB2M-B, SgrB2S, SgrB2M ext., and SgrB2N ext.: $1\times10^{24}$ cm-2 (Lis & Goldsmith 1990); SgrB2M h.c.: $2.7\times10^{25}$ cm-2 (Liu & Snyder 1999); and SgrB2N h.c.: $1.3\times10^{25}$ cm-2 (Belloche et al. 2008). Source sizes for the GC clouds from Brünken et al. (2010), assumed distance to the GC clouds 8 kpc (Reid 1993). b From Marcelino et al. (2009). c From Brünken et al. (2010).


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