X-ray powder diffraction patterns for ice at 200 K in air at ambient pressure (bottom), ice and CO2 clathrate mixture at 220 K and CO2 pressure 20.42 bar (middle) and pure CO2 clathrate at 253 K and CO2 pressure 20.42 bar (top). The strong reflection at ~20° 2θ due to the sapphire capillary has been removed from the data.
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