Nothing
RMarrow <-
function(X1,Y1,X2,Y2){
#targetindex<-dev.cur()
#targetindex<-recordPlot()
arrows(x0=X1,x1=X2,y0=Y1,y1=Y2)
#u<-readline("accept line? (y/n) ")
#if (u=="n")
#{replayPlot(targetindex)}
}
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