Say I haves a bottom that goes up to say 60?????????. I want it to go back to -60?????????. Since that's 60 + 60 plot the curve for 120 degrees. Save that, and open it in the purg. Put in these values and leave everything else blank.
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Then file>Save processed.
The reason you use -90 for tops is so that the curve rotates down. Use 90 for hill bottoms and such.
Hint Hint *** An HSAK curve won't give you an accurate shape for B&M hill tops, nor Intamin.
Hint Hint #2 - Learn FVDs.