Formatting the output of pairs()

Would anyone be able to give me some ideas on how to go about changing
the output of pairs()?

What I want to do is :
 * plot each value as a point (instead of those hollow circles)

set argument panel. Don't known what you mean by a `point' (that would be
invisible, but perhaps pch=20 or pch="."?

 * remove the gap between each scatter plot

set argument gap.

 * make the frame around each scatter plot pale grey

In ... set bty="n", and in your panel function include box(col="grey80").

E.g.

data(iris[, 1:4])
pairs(iris[, 1:4]), gap=0,
      panel=function(x,y, ...) {box(col="grey80"); points(x, y, pch=20)},
      bty="n", diag.panel= function(x,y, ...) box(col="grey80"))

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