hello,

what i'm trying to achieve is shown in the comment (# ...) below, which is
surely very wrong, but probably intuitively more meaningful that i can
provide in words.

xyplot(y~x2|x1+which,data=make.groups(
  "a"=data.a,
  "b"=data.b,
  "c"=data.c
 ),
 panel=function(...){
  panel.abline(a=0,b=0)
  panel.points(...)
  # if(x1==0 & which=="a") panel.abline(...)
 },
 layout=c(2,3),
 pch=20,
 ylim=c(-10,10),
 xlab="x2",
 cex=0.5
)

thank!

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