Table 1: "Standard'' clouds.

Type		 r(pc) $n({\rm cm}^{-3})$ $N({\rm cm}^{-2})$ G0 $F_{\rm X}$ [erg s-1 cm-2]

A		 1 104 - 106.5 $3 \times 10^{22}{-}1 \times 10^{25}$ 102-105 1.6-160
B 10 103 - 104 $3 \times 10^{22}{-}3 \times 10^{23}$ 101-104 $1.6\times10^{-1}{-}16$
C 10 102 - 103 $3 \times 10^{21}{-}3 \times 10^{22}$ 100.5-103 $1.6\times10^{-2}{-}1.6$


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