How can I align multiple plots by their titles instead of plot area?

Question

I\'m using egg to align multiple plots on a page. I\'m wondering if it\'s possible to align two columns by the titles a) and c) instead of plot are

Answer 1

Adding a blank dummy faceting variable to plot p1/ a) seems like the easiest solution

p1 <- ggplot(data.frame(mtcars, dummy=''), 
             aes(mpg, wt, colour = factor(cyl))) +
  geom_point() + ggtitle("a)") +
  facet_wrap(~dummy)