For my fellow R beginners, I wanted to throw out a tip I discovered
while wrestling with some plots...this is no more than a crumb really,
but I found that when using the plot() function, the subtitle (i.e.
sub=" ") is too close to the default x-axis label without some tweaking
of spacing which I have yet to accomplish.
One can eliminate the subtitle and simply by adding "\n" after the title text and then the subtitle text, you can create a 'line break' in the title and the sub-title will be created right underneath.
I didn't think this type of manipulation was possible *within* the quotes surrounding the title text but I continue to be pleasantly surprised that with R, anything is possible.
instead of this-