Hello,

I would like to show in my facet labels the equivalent in LaTex of
$\sigma_{0}= \sqrt{2}$. I think I'm close below, but not yet as it shows
$(\sigma_{0}, \sqrt{2})$

m <- mpg
levels(m$drv) <- c("sigma[0]=sqrt(2)", "sigma[0]=2 * sqrt(2)", "sigma[0]= 3
* sqrt(2)")

ggplot(m, aes(x = displ, y = cty)) + geom_point() +
  facet_grid(. ~ drv, labeller = label_parsed)


Thanks,
Lars.

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