Radial profiles of water gas fractional abundances with respect to total hydrogen nuclei densities /n_H for the whole envelopes on a log scale (top panels) and the inner regions only (r < 200 au) on a linear scale (bottom panels) in NGC 1333-IRAS 2A (left) and NGC 1333-IRAS 4A (right) envelope models. The double-dashed double-dotted lines, the dashed double-dotted lines, the double-dashed dotted lines, the dash-dotted lines, the dotted lines, the dashed lines, and the solid lines show the radial /n_H profiles for values of central star X-ray luminosities L_X = 0, 10²⁷, 10²⁸, 10²⁹, 10³⁰, 10³¹, and 10³² erg s⁻¹, respectively. The line color gradually changes from green to yellow, orange, red, and brown as the value of L_X increases. In Figs. 5–7, C.1, C.2, D.1, E.1, H.1, and H.2, we adopt the same line types and color patterns of the calculated radial fractional abundance profiles of gas-phase molecules for different values of L_X.