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On the Distributions Page there are four graphs. One graph shows the percentage of the surface area pumping. There are two curves in the graph. The black one shows frequencies. The percentage of pumping is indicated on the horizontal axis. The frequencies of incidence as obtained during simulation, in %, are shown on the right-hand vertical axis. The other curve - the green one - is a 'greater-than' curve. Its ordinates, measured on the left-hand vertical axis, indicate the probability of a percentage exceeding the value selected on the horizontal axis. The green curve can be used to determine the confidence intervals for the percentage of surface area pumping.