Hmmm. Maybe a documentation typo in ?spplot.
If you follow the documentation through to ?levelplot, you find
that
cuts: number of levels the range of ‘z’ would be divided into
(no mention of actual breakpoints) but:
at: numeric vector giving breakpoints along the range of ‘z’.
Contours (if any) will be drawn at these heights, and the
regions in between would be colored using ‘col.regions’. In
the latter case, values outside the range of ‘at’ will not be
drawn at all. This serves as a way to limit the range of the
data shown, similar to what a ‘zlim’ argument might have been
used for. However, this also means that when supplying ‘at’
explicitly, one has to be careful to include values outside
the range of ‘z’ to ensure that all the data are shown.
So you might try 'at' instead of 'cuts'.
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