Fig. G.3
Radial profiles of gaseous fractional abundances of O, HCO+, and CH3OH, and icy fractional abundances of CH3OH in the NGC 1333-IRAS 4A envelope models. The profiles are the same as in Fig. G.2, except in the additional model calculations the direct X-ray-induced photodesorption is switched off and only the secondary (indirect) X-ray-induced photodesorption is included (see also Fig. 11).
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