I am trying to add labels equal to the value in a levelplot. I believe that
panel may be the way to go but cannot understand the examples.

In the following example:

X,Y,Z
A,M,100
A,M,200
B,N,150
B,N,225

I would like to label each of the rectangles 100,200,150 and 225 and colour
according to the value

The colouring is achieved by

levelplot(z ~ x *y , data) but then I get stuck with the labels

Thanks very much for your help

Ben

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