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After an extensive assessment of the effective collision strengths availableto model the He-like triplet of C V, N VI, O VII, Ne IX, Mg XI and Si XIII incollisionally dominated plasmas, new accurate effective collision strengths arereported for Ne IX. The uncertainty intervals of the density and temperaturediagnostics due to the atomic data errors are also determined for bothMaxwell-Boltzmann and $\kappa$ electron-energy distributions. It is shown thatthese uncertainty bands limit the temperature range where the temperatureline-ratio diagnostic can be applied and its effectiveness to discern theelectron-energy distribution type. These findings are benchmarked with Chandraand XMM-Newton spectra of stellar coronae and with tokamak measurements.

A benchmark of the He-like triplet for ions with $6\leq Z\leq 14$ in Maxwellian and non-Maxwellian plasmas