Search this on google, you wont regret it.
exp(-((x-4)^2+(y-4)^2)^2/1000) + exp(-((x +4)^2+(y+4)^2)^2/1000) + 0.1exp(-((x +4)^2+(y+4)^2)^2)+0.1exp(-((x -4)^2+(y-4)^2)^2
exp(-((x-4)^2+(y-4)^2)^2/1000) + exp(-((x +4)^2+(y+4)^2)^2/1000) + 0.1exp(-((x +4)^2+(y+4)^2)^2)+0.1exp(-((x -4)^2+(y-4)^2)^2
You Guys Are Amazing! ;D
(As well as my insatiable love for purple)