Spplot labels in R how to change

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Can anyone tell me how to change the labels in a legend created by spplot in R? It is a typical vertical ribbon legend automatically generated by spplot. Based on color, it is labelled 1-7 but I would like to label it 1%-7% and make the labels larger.

I understand that the graphics are based on lattice but it is still difficult to find anywhere how to do what, I would think, would be fairly straight forward.

The code I have is

plot2
 
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