R-beta: vectors in dataframe?

I have a file:

x     y     z
0.025 0.025 1.65775
0.025 0.050 1.62602
0.025 0.075 1.63683
0.025 0.100 1.91847
0.025 0.125 2.00913
0.025 0.150 1.82222
0.025 0.175 1.70901
0.025 0.200 1.39759
0.025 0.225 1.39089
0.025 0.250 1.04762

If I read the file like this:
data<-read.table("file.dat")

How do I access the vectors x,y,z that are inside the dataframe data?  I
studied Venables and Ripley and could not figure it out.

Thanks very much for any help.

Bill Simpson

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