alphamatrix             Computation of Alpha coefficient matrix
btcol                   Auxilliary function computing factors.
btprod                  Auxilliary function computing intermediate
                        products.
drayl3D                 Three dimensional Rayleigh density by series
                        expansion
drayl4D                 Four dimensional Rayleigh density by series
                        expansion
drayl_int3D             Three Dimensional Rayleigh Density by
                        Integration
drayl_int4D             Four Dimensional Rayleigh Density by
                        Integration
zerooneoutput           Non-zero value determination
