[R] dotplot points color

[glaporta]

Dear list, 
is it possible to change the background color of dotplot's points? I tried
in many ways but unsuccessfully 
Thanks in advance
Gianandrea

require(lattice)
dotplot(variety ~ yield | site, data = barley, groups = year, pch=21)
dotplot(variety ~ yield | site, data = barley, groups = year, pch=21,
bg=c("2","3")) ??!!!


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