Examples of the implemented sampling of the Henyey-Greenstein phase function Φ_λ for different values of the anisotropy parameter g_λ. The Φ_λ values on a sphere are visualized using Mollweide projection and according to the colour bar below each panel. The contours of the HEALPix pixels corresponding to the values of k_λ,HP from Eq. (5) are overplotted as black lines. The dark blue circle shows the size of the FWHM [ Φ_λ−Φ_λ(π) ].