Transition energies of highly ionized atoms is a topic of interest in atomic physics, that requires precision measurements from high technology plasma sources and dedicated high resolution x-ray crystal spectrometers. This comparison is a survey of experimental and theoretical values of energies of transitions, from ions in the heliumlike sequence. **The comparison format is 8 columns, one for each paper. Additional contributions classified by Ion, can be reached following the active links within each paper.
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