Here are a couple of good graphics of what the are attempting to do at the current time. Click on the high resolution link for a much better view.
http://www.bp.com/genericarticle.do?categoryId=9033657&contentId=7062491
Thanks!
Back from shooting my bow. Dialed in at 30 meters. Next - 50 meters... gotta go up to the Boy Scout Camp Bashore to use the archery range for that one.
It’s hot & humid here in PA!