Absorbed R-ratio divided by the unabsorbed R-ratio for the O vii (top panel) and Fe xxv (bottom panel) triplets as a function of and σ_v. The contour lines show the factors by which the R-ratio value changes due to Li-like line absorption, including the effect of fluorescent emission. The green vertical lines in each panel indicate N_crit, which is the critical Li-like ion column density limit corresponding to continuum optical depth τ_cont = 1 at the He-like triplet for PIE (solid vertical line) and CIE (dashed vertical line) plasma cases.