FMS at 36 h and 60 h after the beginning of the release, 0.01 ng/m3 contour level. The fraction of models with FMS above a certain threshold rapidly decreases as the threshold increases. At 36 h less than one tenth of the models does not have a FMS>0%, half of the models has a FMS>20%. No model reaches the 70% level, the maximum FMS being equal to 67%. At 60 h eight tenths of the models have a FMS>0% and one third has a FMS>20%. The maximum FMS is 52%.