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Add letters to the corners of plots in multiple figures
letter.it(a, corn = 1)
character letter for marking figure
corner to put letter in
Graphical Side Effects
Can use uppercase or lower case letters, or roman numerals.
# NOT RUN { par(mfrow=c(2,2)) for(i in 1:4) { x <- 1:10 y <- rnorm(10) plot(x,y) letter.it(letters[i], 2) } # }
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