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Hello,  So I want to make an arrow in Epilog point at the numerical value 35.000 on the x-axis, and I also want to include text at the arrow to Illustrate what is happening at 35.000.  Here is how my code looks like: [mcode]Subscript[y, f][x_] :=...
Oh... Thank you! And as for the colouring then?
I need help using ContourPlot to make something like the picture below. The Coordinates for the three circles is: (1500,1200), (1550,2000), (2000,1700) [img=width: 768px; height:...