I have a shapefile that I have loaded in arcmap of some counties. After a piece of python script runs, the counties are shaded to represent some data that was input into the python script. What I would like to be able to do, is outline these counties instead of shading them. Also, to clarify, I would like to be able to outline the outer extent only. I know how to outline each county itself, but what I want is ONE outline for the whole region of selected counties.
Attached is an image of what I'm looking at. I want to be able to outline the whole set of red counties, not just each county. Thoughts?