As I have too much images posted I have to double-post:
Check how the overall fall in handgun homicides coincides with the fall of homicides in larger cities. There are of course other factors at work, but there seems to be a pretty strong relationship, which would be not surprise much. To honest it looks like too good of a fit which makes me almost doubt graph 1. I guess that is the result if you had correct the works/papers of other students...
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