Information on a solid is written to a file for use by program BZ, if MERS is present on the key-word line. The three integers, n1, n2, and n3 define the number of fundamental unit cells in each dimension in a cluster. See Description of BZ for more information on the values of n1, n2, and n3. and MAKPOL for how to construct a data set for use by BZ
The definition of a 'mer' might be of interest. In a polymer or other extended system, the fundamental repeating unit is the mer. For some simple polymers, such as polyethylene, the mer can also be identified with the monomer, in that both the mer and the monomer have the same formula. In other polymers, the mer is not the same as the monomer--condensation polymers are a good example, where the monomer looses water on forming the polymer. In order to be general, therefore, the unit of a polymer is not the monomer, but instead is the mer.