The Reference Print Medium Gamut is an initiative by the ICC aiming at better interopertibilty of perceptual gamut mapping if profiles from differnt vendors are used in the colormanagement workflow. I do research on characterization-data and an icc-profile which are representing the ICC Reference Print Medium Gamut.
Color Management experts are free to download RPMG_alpha1.zip (characterization-data, icc profile and documentation).