Table 4: Two-phase photoionization model for cloud at z=2.517032.
  Observed Model
    Low High
[C/H]   -2.20 $\la $-2.10
$\log U$   -1.15 -0.65
$\log n$ [cm-3]   -3.75 -4.3
Size [kpc]   20 $\la $250
[C/O]   0a $\approx $-0.8
[C/N]   ... $\ga $0.2
$\log N(H {\sc i})$ 14.88 14.58 14.58
$\log N(C {\sc iii})$ 12.50 12.50 $\approx $12.00
$\log N(C {\sc iv})$ 12.73 12.43 12.43
$\log N(O {\sc vi})$ 13.92 12.21 13.91
$\log N(N {\sc v})$ <12.00 11.60 $\la $12.00

a Assumed.

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