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Co Kβ X-ray emission spectra (XES) of Sr2Co0.5Ir0.5O4 at ambient pressure (red line) and 40 GPa (blue line) together with those of Sr2CoO3F19 at 1 GPa (HS) and 17 GPa (LS) and those of LaCoO334 at 17 K (LS) and 803 K (mainly HS).
