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I plotted this ellipse

contourplot = ContourPlot[Sqrt[sig1^2 + sig2^2 - sig1 sig2] - 200 == 0,
                          {sig1, -300, 300},
                          {sig2, -300, 300}]

how can I leave that ellipse fixed, untouched, and plot a second ellipse or whatever curve with different values to see how it changes from the original. Thank you.

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    $\begingroup$ how can I leave that ellipse fixed, untouched, and plot a second ellipse You can use Show to display more than one plot on same axis as in Show[contourplot1, contourplot2] $\endgroup$ – Nasser Dec 3 at 2:55

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