Image:Bvn-small.png

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[edit] Summary

I made this file in the R programming language using the following code:

myseq<-seq(-3,3,length=100)
mygrid<-expand.grid(x1=myseq,x2=myseq)
mygrid$y<-dnorm(mygrid$x1)*dnorm(mygrid$x2)
require(lattice)
png(file="bvn.png", height = 450, width = 1100)
print(wireframe(y~x1*x2,
                data=mygrid,
                shade=TRUE,
                scales=list(arrows=FALSE,
                            x=list(draw=FALSE),
                            y=list(draw=FALSE),
                            z=list(draw=FALSE)
                            ),
                aspect=c(1,1/3),
                xlab="",
                ylab="",
                zlab="",
                par.box = list(col=NA))
      )
dev.off()

followed by some manipulations in The GIMP.

[edit] Licensing

I, the author of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

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