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The volume scattering function(VSF) for water is given by,

VSF(teta) = A(lambda, S)*(1-cos power 2of teta(1-delta)/(1+delta))

where teta is the direction of scatterred radiation.

A is amplitude

lambda is wavelength

S is salinity

delta is depolarization ratio.

How is scatterred direction angle taken for the measurement of VSF i.e. in what range of angles(0, 90,....etc)?