[R] How to draw three line on the same picture ?

[z_axis]

The following is  sampling data:
No   V1  V2 V3
1     0.23 0.12 0.89
2     0.11 0;56 0.12
.......

I just want to draw three lines on same picture according to value of V1, V2
and V3.  

I am a R newbie, so any suggestion is appreciated !
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