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Item _cell.reciprocal_length_a

Description

              The reciprocal cell length (recip-a) in inverse Angstroms.
              (recip-a), (recip-b) and (recip-c) are related to the real cell
              by the following equation:

               recip-a = b*c*sin(alpha)/V

               recip-b = c*a*sin(beta)/V

               recip-c = a*b*sin(gamma)/V

               where V is the cell volume.

               Ref: Buerger, M. J. (1942). X-ray Crystallography, p. 360.
                       New York: John Wiley & Sons Inc.

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