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  Thus, the total number of incident rays is given by R=W*X*Y*A*D, where W is the number of wavelength steps, X is the number of steps in the x direction and so forth. 
  If the incident ray has a wavelength that is less than the smallest entry, the intensity of the smallest wavelength value will be used. 
  Note that once a ray has been divided by this process, it is not subdivided further by this process, but instead is propagated for a random distance, determined using a stochastic equivalent of a turbid medium. 
 www.pv.unsw.edu.au /links/RaySim6/BuildBatch.htm (1340 words) 
