to r=10 AU.
(1) The mean energy of destructive photons from Eq. (5) at the bottom of the extinction layer (see Fig. 5); for photospheric and FUV photons we put and for EUV and X-rays we integrate for (Eq. (10)); (2) absorption cross section per C atom at a frequency ; (3) approximate mean degree of ionization of the gas in the extinction layer ; (4) extinction cross section of gas and dust at frequency normalized to cm2 g-1; (5) number of expelled atoms x per absorption event from Eq. (14); (6) altitude of the bottom of the extinction layer in units of the scale height H; (7) thickness of extinction layer; (8) mean time from Eq. (4) in which one photon is absorbed; (9) critical vertical velocity for PAH survival.
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