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Figure 2. Plot of estimated cumulative probability function versus the largest difference between adjacent CT values for data given inTable 1. (a) Gumbel plot. Straight line represents line fitted to data (r = 0.992). (b) Frechet plot. Curved line represents quadratic polynomial fitted to data (r = 0.992). Broken straight line represents linear polynomial fitted to data (r = 0.975). (c) Weibull plot. Curved line represents quadratic polynomial fitted to data (r = 0.991). Broken straight line represents linear polynomial fitted to data (r = 0.966).