legend for scatter plots with just a single dot

hi all,

i’m plotting a scatter plot with several kinds of markers and would like to display a legend for them. if i try the following:


then the legend shows three dots (of the same type used in the scatter plot) in this strange arc configuration, with the label ‘a’ next to it. how can i make it so it just displays a single dot instead?

also, is there a way to make the legend display outside the figure?