XRD data of a powder Fe3C sample at 48 GPa and 300 K, after being heated at ∼1400 K for about three days (run 090-DAC-III). The data were collected at beamline 16-ID-B of the APS (λ = 0.42348 Å). (a) Debye–Scherrer patterns recorded on the image plate. (b) The corresponding spectrum and expected peak positions of Fe3C and NaCl. The peaks at 13.32° and 17.26° do not belong to Fe3C or NaCl, but can be matched by h.c.p.-Fe.