Variogram Legend

I am unable to figure out how to resize the legend in both the experimental variogram plot and the modeled variogram plot. The "cex" argument only seems to impact the size of the characters (numbers) when I ask to plot the number of pairs (for example). It does not change the size of the legend. However, in db.plot, the cex argument does change the size of the legend. What is the syntax for modifying the size of the legend when plotting the variogram (for both the experimental and the model)? Thank you!