[R-sig-Geo] Fix extreme values on legend

[Jue Lin-Ye]

Greetings!

I have been using spplot to draw maps of the NW Mediterranean and
sub-regions. I would like to compare them, so I need the same range of
values to be displayed on the legends. I know that I can manually fix the
*colors*, but I do not know if I can fix the extreme *values* on spplot (I
know that I can do so with image.plot, but it is not what I desire).

Thank you in advance!

-- 
Jue Lin-Ye

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