Draws a large NA in the middle of the plotting area. This plot is useful when all X or Y data is NA
ggally_na(data = NULL, mapping = NULL, size = 10, color = "grey20", ...)
ggally_naDiag(...)ignored
ignored
size of the geom_text 'NA'
color of the geom_text 'NA'
other arguments sent to geom_text