and a link to a good article
http://www.nfl.com/combine/story/09000d5d80ecd9a3/article/what-does-the-combine-data-mean-depends-on-your-position (http://www.nfl.com/combine/story/09000d5d80ecd9a3/article/what-does-the-combine-data-mean-depends-on-your-position)