mirror<-function(m){
x<-m$x
y<-m$y
z<-m$z
md<-rbind(cbind(x,y,z),cbind(-x[x>0],y[x>0],z[x>0]))
mdd<-as.data.frame(md)
return(mdd[with(mdd,order(y,x)),])
}
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