[R] How to plot graph with different scale (y axis) on same graph?

[Manish Gupta]

Hi, 

I have my data in below format.

position         var1            var2
2                       .1                 10
3                       .29               89
12                    .56               100
425                 .34                1234
6546              .12                 21
....                   .....                 .....
....                   .....                ......
....                   .....                ......

I need to plot a grpah for above with position as x - axis and two variables
with as line on the same plot. I have 5 million records.  How can i
implement it efficiently.

Regards

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