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I tried this on Mathematica 8.0.4 on a Mac and it shows the same problem (missing vertical lines at x={60,80} also. ![enter image description here][1] [1]: /c/portal/getImageAttachment?filename=yyy.jpg&userId=368307 What version and OS...
Thanks for this info about the brach cut discontinuity. But I'm not exactly sure how this fits what the results of the two plots show. since Power[] is being used the same in both cases (the only difference is Power[] is nested once more in the...