Table 4: Mean intensities of the first rotational transitions of ortho and para  H_2O (in ${\rm erg~cm^{-2}~s^{-1}~sr^{-1}}$) and (last column) optical depth at line centre for model PDR-c.
Transition $\lambda_{\rm ul} {\rm (\mu m)}$ PS05 PDR-a PDR-b1 PDR-b2 PDR-c $\tau_{\rm c}$
$o{-}\element{H_{2}O}~ 1_{10}\rightarrow1_{01}$ 538.2 $ 4.00\times 10^{-8}$ $2.16\times 10^{-8}$ $2.58\times 10^{-8}$ $3.30\times 10^{-8}$ $3.58\times 10^{-8}$ 429
$o{-}\element{H_{2}O}~ 2_{12}\rightarrow1_{01}$ 179.5 $ 5.66\times 10^{-7}$ $1.03\times 10^{-9}$ $1.00\times 10^{-7}$ $9.84\times 10^{-7}$ $8.69\times 10^{-7}$ 430
$o{-}\element{H_{2}O}~ 2_{21}\rightarrow1_{10}$ 108.1 $ 8.26\times 10^{-10}$ $1.14\times 10^{-13}$ $2.47\times 10^{-8}$ $4.18\times 10^{-7}$ $7.04\times 10^{-7}$ 0.97
$o{-}\element{H_{2}O}~ 2_{21}\rightarrow2_{12}$ 180.5 $ 5.90\times 10^{-11}$ $9.40\times 10^{-15}$ $2.24\times 10^{-9}$ $3.61\times 10^{-8}$ $6.50\times 10^{-8}$ 0.12
$o{-}\element{H_{2}O}~ 3_{03}\rightarrow2_{12}$ 174.6 $ 5.70\times 10^{-10}$ $1.80\times 10^{-13}$ $5.01\times 10^{-10}$ $4.73\times 10^{-8}$ $1.22\times 10^{-7}$ 0.24
$o{-}\element{H_{2}O}~ 3_{12}\rightarrow2_{21}$ 260.0 $ 1.86\times 10^{-12}$ $1.24\times 10^{-15}$ $6.15\times 10^{-13}$ $1.55\times 10^{-10}$ $4.56\times 10^{-10}$ $2.6\times10^{-3}$
$o{-}\element{H_{2}O}~ 3_{12}\rightarrow3_{03}$ 273.2 $ 1.11\times 10^{-11}$ $7.27\times 10^{-15}$ $3.62\times 10^{-12}$ $9.13\times 10^{-10}$ $2.68\times 10^{-9}$ $2.5\times 10^{-3}$
$p{-}\element{H_{2}O}~ 1_{11}\rightarrow0_{00}$ 269.3 $ 1.76\times 10^{-7}$ $9.88\times 10^{-9}$ $5.37\times 10^{-8}$ $2.96\times 10^{-7}$ $2.64\times 10^{-7}$ 1672
$p{-}\element{H_{2}O}~ 2_{02}\rightarrow1_{11}$ 303.4 $ 1.78\times 10^{-9}$ $7.75\times 10^{-11}$ $1.68\times 10^{-9}$ $4.25\times 10^{-8}$ $9.75\times 10^{-8}$ 1.13
$p{-}\element{H_{2}O}~ 2_{20}\rightarrow1_{11}$ 101.0 $ 1.93\times 10^{-10}$ $1.34\times 10^{-14}$ $9.66\times 10^{-9}$ $5.24\times 10^{-7}$ $9.37\times 10^{-7}$ 1.88
$p{-}\element{H_{2}O}~ 2_{11}\rightarrow2_{02}$ 398.6 $ 3.34\times 10^{-11}$ $1.64\times 10^{-13}$ $1.92\times 10^{-10}$ $1.26\times 10^{-8}$ $2.88\times 10^{-8}$ $2.9\times 10^{-3}$

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