where the summation index c now runs over the various crystalline substances present (e.g. barite, rutile hematite, crocoite, etc.). In Fig. 2, as examples the phase-specific 2θ patterns of hematite [Ghematite(2θ)], Zn-yellow [GZn−yellow(2θ)] and talc [Gtalc(2θ)] are shown, as well as the residual background profile B(2θ). In Fig. 3, the sinograms of barite and rutile (resp. Sbarite(x, ω) andSrutile(x, ω)) are shown.