Radiative recombination rate coefficients (black lines) as a function of temperature for ground state target ions Kr⁺ (solid curve), Kr²⁺ (dotted curve), Kr³⁺ (short-dashed curve), Kr⁴⁺ (dash-dot-dash curve), Kr⁵⁺ (long-dashed curve), and Kr⁶⁺ (dash-dot-dot-dot-dash curve). For comparison, the approximate rate coefficients of Mattioli et al. (2006) are depicted as gray curves, with the line styles corresponding to the same ions.