Plotting 2 Lines on the Same Chart

When I use

Plot(series1)
lines(series2)

The graph will use the y axis scaling for series 1 so some of series

2 is

cut off.  How do I control the y axis scaling?

Plot them together as a multivariate series as in the examples

already

pointed to.

...or try 

plot(series1, type="l", ylim=range(pretty(c(series1, series2))) )
lines(series2)

which gives more-or-less sensible ylim scaling based on all the data.
Adding 0 inside the c() will guarantee that zero is in the vertical
scale, too.


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