Propane-hydrate
      Kirchner M T, Boese R, Billups W E, Norman L R
      Journal of the American Chemical Society 126 (2004) 9407-9412
      Gas hydrate single-crystal structure analyses
      Sample: (C3H8)8(H2O)136, T = 123 K
      Locality: synthetic
      _database_code_amcsd 0019153

      CELL PARAMETERS:   17.1750  17.1750  17.1750   90.000   90.000   90.000
      SPACE GROUP: Fd-3m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   5066.292
      Density (g/cm3):      1.069
      MAX. ABS. INTENSITY / VOLUME**2:      64.06827261    
      RIR:     19.519
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 8.92        100.00        9.9160    1   1   1         8
                14.59         14.85        6.0723    2   2   0        12
                17.89          4.22        4.9580    2   2   2         8
                20.69          4.87        4.2937    4   0   0         6
                22.57          7.10        3.9402    3   3   1        24
                26.98          1.41        3.3053    3   3   3         8
                29.42          3.07        3.0361    4   4   0        12
                31.25          1.76        2.8625    4   4   2        24
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.