plot -20*e%5E%28-0.2*sqrt%280.5*%28x%5E2 %2B y%5E2%29%29%29 - e%5E%280.5*%28cos%282*pi*x%29 %2Bcos%282*pi*y%29%29%29 %2B 20 %2B e over -5%2C5

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