How to Increase the thickness of the box lines in an R boxplot?

Question

How can I increase the thickness of the lines that outline \"box\" part of a boxplot using either the base R plot or boxplot function? That is, how do I thicken the lines o

Answer 1

Are you talking about the rectangle that surrounds the plot area? If so, then this can follow you plot call:

 box(lwd=5)