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Figure 3
(ab, cd, ef) Evaluation of P and T differences for each pair of calibrants in experiment BT654. The y-axis shows the errors from the joint P and T calculation using the custom software (EosCross; see online supporting information). The x-axis shows the difference between the P and T calculated using the software and the P and T constrained by the thermocouple temperature. The 1:1 lines indicate a one-to-one agreement. For each colour-coded press load step, the points are connected by dotted lines following the incremental increase in heating power. There is no clear suggestion that peak fitting errors or differences from the thermocouple measurement follow a systematic trend with increasing P and T. Generally, the more points inside the shaded region and the smaller the differences, the better the choice of PT calibrants.

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