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Bug in Contour Plot

This worksheet shows how to make contour plots for arbitrary function z=f(x,y) with predetermined intervals. The number of contour lines and its resolution can be specified. Moving the testpoint you can study the properties of the surface: contour lines, extrempunkten. Use „Tracing on“ for the list1--> leads to unexpected results. Results of traces of previous calculations disappear...In this example from z0=1.2