Making a dotplot in R

Dot plots have a continuos variable, plotted against a factor. Usually with form of jitter and transparency to make the frequency stand out. Almost like a pointillism inspired box plot.

ggplot(plotdata, aes(x = altitude..m., y = as.factor(index), colour = speed)) +
  geom_point(position = position_jitter(w = 0.0, h = 0.1))  +
  scale_colour_gradient(low='blue', high='red')
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