[R] More detail in chart axis?

[Noah Silverman]

Hi,

I have a series of data (about 80,000 pairs of x,y).

Plotting it shows a great chart.  However, R has randomly chosen about 6
labels for my x axis.  Now, clearly I can't show them all, but would
like some control over the granularity of what is displayed.  I can't
find anything in the documentation about controlling the axis data
labels.  Is there a way?

Alternately, is there a package that would allow me to zoom into an area
of the chart so I can see more detail?

Thanks,

-N