As @joran suggested, using geom_hline
and geom_vline
is defenitely a solution. Simple define the yintercept
and xintercept
respectively like so:
...
+ geom_vline(xintercept=seq(7.08, 7.14, by=0.01))
+ geom_hline(yintercept=seq(50.93, 50.96, by=0.01))
...