Dominant disk ionization source throughout the disk. A light grey area indicates a region without a dominant ionization source. The different possible ionization sources, X-rays, SPs and CRs are identified by the different colors (color bar). The white solid contour line shows N_{⟨ H ⟩ ,rad} = 10²⁵ cm^-2 the white dashed line shows the CO ice line. The model names are given in the top left of each panel. Top row: models with ISM CR ionization rate (CI); bottom row: models with low CR ionization rate (CL). First column: normal X-ray models (XN); second column: high X-ray models (XH); third column: turner models (T).