[R] Help with plot Grouped Bar Plot by using R

[R_beginner_starter]

Hi, Jim

Below is the code that I try and the result I obtained:

*br<-read.table("R_beginner_starter.dat",header=TRUE,sep="\t") 
library(plotrix) 
barp(t(br[,c(2,4)])) 
*
The result generated:
http://r.789695.n4.nabble.com/file/n4468592/ScreenHunter_01_Mar._13_17.10.jpg 

Which is different with my desired output bar graph :(
Do you have any idea to solve it out?

Thanks for advice.

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