Trying to make my boxplot look nicer...

Default gives this:

Some ideas here:
http://thinkdatavis.com/2013/06/05/how-to-make-nice-boxplots-with-r/

frame = "f"



boxplot(grades$Grade_Dig, grades$Grade_Pres, xaxt="n", outline=FALSE, col = "gray", lwd=3)

lwd controls size of lines


advice from here:
http://grokbase.com/t/r/r-help/097yxa4jh3/r-how-to-change-the-thickness-of-the-lines-of-the-boxplot-outliers


this is what I have right now:

> boxplot(grades$Grade_Dig, grades$Grade_Pres, xaxt="n", outline=FALSE, col = "gray", lwd=3, frame="false")

If I enlarge and take a screen shot, I get this...