Atonal Actuary

First time I saw this type of plot was in the „Broken Limits to Life Expectancy“ paper by Oeppen and Vaupel. They added the different historical „expert judgements“ for where the growth of life expectancy was promised to stop. (Spoiler: it didn’t stop.)

Thanks for pointing this out!

Since the „official“ documentation does not seem to highlight Option C: Do we know whether this is a „hack“ that might break in a future ggplot update?