Radial profiles of gaseous fractional abundances of O, HCO⁺, and CH₃OH, and icy fractional abundances of CH₃OH in the NGC1333-IRAS 4A envelope models. The line types and color patterns for the radial profiles of our standard model calculations (see also Figs. 5, 6, and 7) and additional model calculations are the same as in Fig. G.1. In the additional model calculations, we include the secondary (indirect) X-ray-induced photodesorption (see also Fig. G.1).