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Table 5:

Fractional abundances and abundance ratios from the alternative gas-phase modela.

T = 10 K 		HNCO/H2 HOCN/H2 HCNO/H2 HONC/H2 HNCO/HOCN HNCO/HCNO HCNO/HOCN
  $\times10^{13}$ $\times10^{13}$ $\times10^{13}$ $\times10^{13}$      

n(H2) cm-3 		             
$1 \times 10^3$ 3.5 0.72 4.6 1.0 4.9 0.80 6.4
  1000 91 280 170 11 3.6 3.1
$3 \times 10^3$ 9500 850 630 180 11 15 0.7
  21 000 1700 1200 550 12 17 0.7
$1 \times 10^4$ 19 000 1500 330 45 13 58 0.2
  48 000 2700 630 120 18 76 0.2
$3 \times 10^4$ 18 000 1300 96 4.6 14 190 0.07
  55 000 2100 190 12 27 300 0.09
$1 \times 10^5$ 9400 730 19 0.2 13 490 0.03
  41 000 1100 40 0.6 37 1000 0.04
$3 \times 10^5$ 3400 330 4.4 0.02 10 770 0.01
  20 000 490 11 0.05 40 1800 0.02
$5 \times 10^5$ 2000 220 2.3 0.005 8.9 850 0.01
  13 000 320 6.4 0.02 40 2000 0.02
106 900 120 1.0 0.001 7.3 910 0.01
  7100 170 2.9 0.003 41 2400 0.02
T = 50 K HNCO/H2 HOCN/H2 HCNO/H2 HONC/H2 HNCO/HOCN HNCO/HCNO HCNO/HOCN
  $\times10^{13}$ $\times10^{13}$ $\times10^{13}$ $\times10^{13}$      

n(H2) cm-3 		             
$1 \times 10^3$ 17 000 590 2000 1100 30 8.8 3.4
  26 000 930 3100 2300 28 8.4 3.3
$1 \times 10^4$ 32 000 840 470 66 38 68 0.6
  110 000 1900 970 110 56 110 0.5
$1 \times 10^5$ 9600 260 26 0.4 37 370 0.1
  49 000 720 56 0.6 68 880 0.08
$1\times 10^6$ 1000 18 1.0 0.001 57 990 0.06
  6700 25 2.3 0.002 270 2900 0.09

Notes. For each density and temperature, the first line refers to steady state whereas the second line refers to early time. Early-time results computed at maximum of HNCO abundance. (a) With the rate coefficients for CH2 + NO calculated by Zhang et al. (2004), in which HCNO is not a major product. See text.


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