Well Pat's correct again, You can't tell boo from a picture. Benign? What is that? If we were talking cancer, it would be a good thing.
As for measuring the width, I never really thought about it in terms of an actual distance, more, how it plays. If one is to play this hole as a three shotter, the approach is narrow. A miss of less than ten yards will vurtually gaurantee sandom. And since Baxter has a propensity for FUN, I have come close to this green in two, twice. Both attempts trusted what wasn't completly visable. So, busting three wood from 250, to this narrow green and narrow surrounds is the antithesis of benign, imo.
Since Pat has further defined what he meant by narrow (12th at Augusta), the last green I saw that closely resembled that one was on a par 3 at "the missing links" of Mequon. I believe the hole was named "master"
Definitely the shallowest green I have ever seen.