plot.xts object --- how to make legend fonts bolder?

Question

I have the following codes which works. I want to make the legend fonts bolder but I'm using the auto legend at the moment, just wondering if it is possible to do it? Many thanks in advance!

plot.xts(Margins, 
         screens = c(1,1,2,2,3,3,4,4),
         col = brewer.pal(n=9,"PuBu")[c(8,4,6,9)], lwd = 6,
         legend.loc = c("topright"), auto.legend = T,
         main="Margin Comparison")

Answer 1

just use font=2 as argument.

plot.xts(Margins, 
         screens = c(1,1,2,2,3,3,4,4),
         col = brewer.pal(n=9,"PuBu")[c(8,4,6,9)], lwd = 6,
         legend.loc = c("topright"), auto.legend = T,
         main="Margin Comparison",
         font = 2
)