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Caption : fig. s1 x-ray photoelectron spectroscopy of cro2 at ambient conditions, c element is used for instrument calibration.

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Caption : fig. s2 relative enthalpies of cacl2-type (pnnm) structure of cro2 compared to the rutile-type (p42/mnm) structure under different pressures.

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Caption : fig. s3 the calculated difference charge density of the rutile-type structure (10 gpa) and the cacl2-type structure (16 gpa) for cro2