[R] scatterplot with wrong line offset

[fm3c2007]

Hi All,

I'm trying to do a Scatterplot (package: car), and add a line (just for
reference).

There is my code:
#------------------------------------Code---------------------------------------------------
library("car")
library("calibrate")
G_T<-c("car","bike","boat")
ave<-c(80,10,45)
perf<-c(100,80,75)
df2<-data.frame(G_T,ave,perf)

scatterplot(ave ~ perf, data=df2,smoother=FALSE,xlim=c(0,100),ylim=c(0,100))                                                                  
textxy(df2$perf,df2$ave, df2$G_T)

#The wrong offset begin here.
grid()
lines(x=c(0,40),y=c(20,20),type="l")
#---------------------------------------------------------Code
end---------------------------------------------

Here is the plot:
<http://r.789695.n4.nabble.com/file/n4647202/Offset_Scatterplot.png> 

My problem is that the line should start at (0,20) and end at (40,20) , and
it has a offset...
What should i do? 

Thanks
Francisco



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