Radial profiles of water ice fractional abundances /n_H in NGC1333-IRAS 2A (left panel) and NGC 1333-IRAS 4A (right panel) envelope models. The line color gradually changes from green to cyan, blue, and indigo as the value of L_X increases. The profiles for L_X = 0−10²⁹ erg s⁻¹ almost overlap. In Figs. 7, C.1, and C.2, we adopt the same line types and color patterns of the radial fractional abundance profiles of icy-phase molecules for different values of L_X.