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134 CHAPTER 6. JWAT - WORKLOAD ANALYZER TOOL 3 x10 2.2 2.0 F r e q u e n c i e s 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Variable Bytes transferred 3.5 4.0 4 x10 Figure 6.22: Histogram, or frequency graph, of the variable ”Bytes transferred” Figure 6.23: QQ-plot preview for the comparison of a given distribution with an exponential or a normal ones. Figure 6.24: Selection of the transformation to apply to the original data Figure 6.25: Sampling extraction criteria that can be applied on the selected variables Figure 6.26: Filter of the percentiles of a variable (trimming of the distribution)