https://www.google.by/search?q=exp((-(((x-4)%5E2%2B(y-4)%5E2)%5E2))%2F1000)%2Bexp((-(((x%2B4)%5E2%2B(y%2B4)%5E2)%5E2))%2F1000)%2B0.15*exp(-(((x%2B4)%5E2%2B(y%2B4)%5E2)%5E2))%2B0.15*exp(-(((x-4)%5E2%2B...