[R-sig-Geo] lattice, xyplot, sp, spplot: is it possible to fix maximum and minimum values in the key ?

[Patrick Giraudoux]

Hi,

Does anybody knows if it is possible to fix user defined maximum and 
minimum values in the key of a xyplot (or spplot) graphics ? I have a 
set of seperate drawings and I would like to keep the same color scheme 
between fixed values for all of them (which looks like being not 
possible, autokey normally adapting the range of colors to the 
particular range of values in each plot.

Patrick