hi when i type :
p(x,y)=x*y
sum(map(lambda u:implicit_plot(p-u, (-9, 9), (-9, 9),color=Color(sin(u**3/10), 1.0, 1, space='hsv')), range(-3,2)))
i would like to parameter the linewidth more fine how can i do ? the argument thickness seems not to be dealed by implicit.plot
Vincent
