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The treatment of strongly anisotropic scattering phase functions is still a challenge for accurate radiance computations. The new Delta-M+ method resolves this problem by introducing a reliable, fast, accurate, and easy-to-use Legendre expansion of the scattering phase function with modified moments. Delta-M+ is an upgrade of the widely-used Delta-M method that truncates the forward scattering peak with a Dirac delta function, where the '+' symbol indicates that it essentially matches momentsdoi:10.1175/jas-d-17-0233.1 pmid:33867576 pmcid:PMC8051203 fatcat:g65ctzk2bfd2tbosfzhhumj5my