[R] Second axis on bottom of graph

[Hurr]

I was able to put tck=-0.1 into either par() or 
axis() and it made a tick difference I understood.
As I understand it, default for mgp is c(3,1,0).
When I put mgp=c(3,4,0) or mgp=c(3,7,0) into 
either par() or axis() I see no difference.
Hurr




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