Fig. 8. Relation of z-scored range-based fixed pattern index (PI) and range-based variable pattern index (PI) (min. 20%) with three and four groups to root mean square error (RMSE), as computed from 48 simulations of soil water content (m³ m^–3) performed with the model MACRO. The exponential curve interpolates across dominant solutions. Critical values of the pattern indices are reported for p = 0.05 (solid line) and p = 0.01 (dotted line).