Hello, useR:,

Suppose I have two plots made by using contour() function, say Cont1 and Cont2 respectively. 

They have slightly difference because of the two slightly different data  I used.

I want to see the difference between them so I want to plot Cont2 on Cont1, are there any methods to plot it without filling the frame of Cont1 totally of Cont2.
I mean, how I can integreate the two plots together that they kind of have weighted colors?

Thanks very much in Advance!

Leon
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