### ** Examples
#Load data
data(Feldspar)
plot <- ggtern(data=Feldspar,aes(Ab,An,Or)) +
geom_point() + #Layer
theme_bw() + #For clarity
theme_hidegrid() #Turn off both major and minor
plot
#Demonstrate switching on major, minor and both gridlines
plot + theme_showgrid_minor() #show minor only
plot + theme_showgrid_major() #show major only
plot + theme_showgrid() #show both major and minor
#Demonstrate switching OFF major, minor and both gridlines, Uncomment to run
#plot <- plot + theme_showgrid() #as before
#plot + theme_hidegrid_minor() #show major only (hide minor)
#plot + theme_hidegrid_major() #show minor only (hide major)
#plot + theme_hidegrid() #show none (hide both major and minor)