How to use subscripts in ggplot2 legends [R]

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The following should work (remove your line with names(temp) <-…):

ggplot(temp.m, aes(x = value, linetype = variable)) + 
  geom_density() + facet_wrap(~ a) +    
  scale_linetype_discrete(breaks=levels(temp.m$variable),
                          labels=c(expression(b[1]), expression(c[1])))

See help(scale_linetype_discrete) for available customization (e.g. legend title via name=).

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