explain---Chart Description: * **Type:** Line chart with marked data points. * **Coordinate Axes:** * X-axis labeled "FPR", with values ranging from 0.0 to 0.8, marked at intervals of 0.1. * Y-axis labeled "TPR", with values ranging from 0.4 to 1.0, marked at intervals of 0.1. * **Data Points:** Four points are plotted and connected by lines: * Point 1: (0.0, 0.4) * Point 2: (0.0, 0.8) * Point 3: (0.4, 1.0) * Point 4: (0.8, 1.0) * **Lines:** Straight line segments connect the points in the following order: * From (0.0, 0.4) to (0.0, 0.8) * From (0.0, 0.8) to (0.4, 1.0) * From (0.4, 1.0) to (0.8, 1.0)

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