Frequency (or level of agreement) maps of a threshold exceedance of 10 kBq/m² for ¹³⁷Cs deposition, for a number of discrete bands of percentiles, without (left) and with (right) additional perturbations on the source term combined with the application of a meteorological ensemble. The x- and y-axis show the distance from the source in kilometers. REM1 case study, short release.