this point, scattering is assumed, and a new direction of travel is determined by selecting values for the Eulerian angles a and A relative to the old direction. Angle A represents a counterclockwise rotation of the original xy coordinate axes about the z axis. The value for A is selected from a uniform angular distribution ranging from 0 to 2tt. The direction of propagation along the new z axis is obtained by a counterclockwise rotation of the old z and new y axes about the new x axis through the angle a. The probability of a photon being scattered between 0 and the angle a is given by the normalized integral over solid angle of the scattering phase function P(a). A
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