[pstricks] implicit function

Denis Vergès Denis.Verges at wanadoo.fr
Wed Mar 1 23:45:13 CET 2006

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Hello,
I want draw
z=- x^2  + 600x - 2xy + 800y - 2y^2
for z = 0, 20 000, 40 000, 60 000, 80 000, 100 000
Thanks in advance for help.
Denis

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