I have four large two-dimensional matrices of which I want to create contour
plots. Something like

filled.contour(<matrix>)
contourplot(<matrix>)

works but only gives me one plot at a time. If I combine the four matrices
into one three-dimensional matrix, which I'll name "seven", there should be
a way of doing something like this

contourplot(seven[,,k] for k in 1 to 4)

such that they come out as one plot rather than four. I couldn't figure out
how to do this, so I tried a disgusting alternative that involved generating
x,y and k vectors, but I'd rather do it properly.

Tom

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