Taylor Plot Diagram_Problem

Greeting to all,
I am constructing Taylor Diagram with the help of the following code:

library(openair)
L<-all$lightning
C<-all$CAPE
Parameters<-all$Group
df<-data.frame(L,C,Parameters)
TaylorDiagram(df, obs = "L", mod = "C", group ="Parameters",lwd = 5 , pch=20, pcex=2,cols =c("green","blue", "red"), add =TRUE, main="EC", annotate = "",rms.col="red", arrow.lwd=5,cor.col="black")

I want to make the axis text and values in bold. Kindly help me out hear.