Radiative damping effects on effective collision strength (ΥZ²) of 2−6(2p_1/2 − 3s_1/2) transition in a) Si¹³⁺ and b) Kr³⁵⁺. The dashed line represents the direct excitation (DE) background contribution. The dotted line is undamped Υ results including the resonance excitation (RE) contribution. The dash-dotted line is damped results by resonant stabilizing (RS) transitions. The solid line stands for total Υ-values damped by both RS and DAC (Decays from the resonances into low-lying autoionizing levels possibly followed by autoionization cascade) transitions.