[R] How to split data for NMDS plots

[Trey]

Here is the code I have used to this point:


 
> trba<-read.table("c:\\Rdata\\NMDS\\trba.txt",header=T,row.names=1)
> attach(trba)
> trba
>bat<-metaMDS(trba)
plot(bat, display = c("sites"))


Given this simple code and my previous example of the matrix, how would I go
about splitting the data out for the plot?  
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