The distribution of cells in Natura 2000 areas that contain grassland among the Zonation priority rank values. Different priority rank categories are given on the x-axis at 5% intervals, and the y-axis indicates the frequencies of cells in each category. The low-ranking Natura cells typically occurred inside or at the edges of forest- and mire-dominated Natura areas that were not targeting semi-natural grasslands, but happened to contain some sparse grassland cells of lower value.