# Add horizontal line to demarcate hurricane status load("anita.RData") ggplot(anita, aes(x = timestamp, y = wind)) + geom_line( linetype = 1, linewidth = 0.5 ) + geom_point( color = "deepskyblue4", size = 2 ) + geom_hline( linetype = 3, yintercept = 64 ) + labs( y = "Wind Speed (Knots)", x = "Date", title = "Hurricane Anita" ) + theme_classic()