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Thus an alternative definition of the scattering coefficient is the integral of the volume scattering function over all directions.

It is frequently useful to distinguish between scattering in a forward direction and that in a backward direction. We therefore partition the total scattering coefficient, b, into a forward scattering coefficient, bf, relating to light scattered from the beam in a forward direction, and a backward scattering coefficient (or simply, backscatter-ing coefficient) bb, relating to light scattered from the beam in a backward direction b = bb + bf

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