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Figure 1. Graph shows the step (solid line) and linear (dashed line) CAD weight functions used to combine the mass marker output with the observer data. The horizontal axis represents the level of normality of the CAD markers, expressed as the number of normal (ie, noncancerous) regions per image that would be hit by the CAD system on average when only the markers on regions with levels of suspicion smaller than that level of normality would be displayed.