New boolean arg: 'add_border' allows user to add a gray border around each line. This is very helpful if you have a palette with light colors as it makes them pop a bit more against the background and thus easier to see. In reality, this is another ggplot2 segment layer with a width of 1 + size_activity and colored gray. Future improvements could include the addition of args for setting this 'outline' layer width and color.
New boolean arg: 'add_border' allows user to add a gray border around each line. This is very helpful if you have a palette with light colors as it makes them pop a bit more against the background and thus easier to see. In reality, this is another ggplot2 segment layer with a width of 1 + size_activity and colored gray. Future improvements could include the addition of args for setting this 'outline' layer width and color.