A clean ggplot2 theme based on ggplot2::theme_bw(), optimized for
publication-ready neuroimaging figures. Uses Arial font, no minor
gridlines, and a bottom legend.
Examples
if (FALSE) { # \dontrun{
library(ggplot2)
ggplot(mtcars, aes(wt, mpg)) + geom_point() + theme_sci()
} # }