I am trying to add an error bar in the legend to indicate a 95% confidence interval. I want it to be a single color. I have three groups of estimates that are plotted across three different colors using ggplot()+geom_point+geom_error_bar(). The current legend only has the geom_point in the legends and I turned off the geom_error_bar() legend.
How can I add a random addition to the legend to indicate the 95% confidence interval as a single error bar that is a neutral color?