

I guess it means that its easy to do magic fourier transforms to get the atom positions...low er B-factors..
edit : "In 1991, the International Union of Crystallography decided to redefine the term "crystal" to mean any solid having an essentially discrete diffraction diagram..."
( ,
Mon 8 Jun 2009, 9:44,
archived)
edit : "In 1991, the International Union of Crystallography decided to redefine the term "crystal" to mean any solid having an essentially discrete diffraction diagram..."