Well, I've been looking in this site to make two histograms in one plot. I get to
ggplot()+geom_histogram(data=etapa1, aes(x=AverageTemperature),col="red")+
geom_histogram(data=etapa2, aes(x=AverageTemperature),col="blue")
I've got two histograms with different colours, but I don't get a legend or a label which shows which is each colour. How can I produce it?