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Representative single-crystal energy dispersive x-ray diffraction patterns of the investigated methane hydrate phases. (a) Three orthogonal orientations of the sH crystal at 600 MPa; 2θ = 8.027°, Ed = 88.569 keV⋅Å. (b) First three diffraction lines of the sII crystal at 250 MPa; 2θ = 8.004°, Ed = 88.828 keV⋅Å. Overtones are observed up to 90 keV, but are shown only to 60 keV. Weak peaks appearing at noninteger positions are fluorescence or escape peaks due to the intense reflections.
