Urea
      Guth H, Heger G, Klein S, Treutmann W, Scheringer C
      Zeitschrift fur Kristallographie 153 (1980) 237-254
      Strukturverfeinerung von harnstoff mit neutronenbeugungsdaten bei
      60, 123, 293 K und X-N- und X-X (1s2)-synthesen bei etwa 100 K
      Sample: T = 60 K
      _database_code_amcsd 0010834

      CELL PARAMETERS:    5.5720   5.5720   4.6860   90.000   90.000   90.000
      SPACE GROUP: P-42_1m   
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    145.487
      Density (g/cm3):      1.371
      MAX. ABS. INTENSITY / VOLUME**2:      9.731524626    
      RIR:      2.312
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.57        100.00        3.9400    1   1   0         4
                24.83         22.19        3.5863    1   0   1         8
                29.62         28.21        3.0157    1   1   1         4
                32.13          6.41        2.7860    2   0   0         4
                36.04         14.82        2.4919    2   1   0         8
                37.56         12.23        2.3947    2   0   1         8
                38.42          1.55        2.3430    0   0   2         2
                41.02          4.80        2.2001    2   1   1         8
                41.82          6.25        2.1598    1   0   2         8
                45.02          2.02        2.0138    1   1   2         4
                46.07          5.71        1.9700    2   2   0         4
                50.24          6.45        1.8160    2   2   1         4
                53.04          2.84        1.7267    3   0   1         8
                53.70          1.59        1.7070    2   1   2         8
                55.73          7.47        1.6493    3   1   1         8
                61.50          1.15        1.5078    2   2   2         4
                61.67          1.55        1.5040    1   0   3         8
                70.53          1.70        1.3353    4   0   1         8
                71.25          2.25        1.3235    2   1   3         8
                71.89          2.19        1.3133    3   3   0         4
                76.45          1.42        1.2459    4   2   0         8
                82.53          1.63        1.1688    3   1   3         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.