00340nas a2200145   4500000000100000000000100001008004100002260001200043100001300055700001600068700001900084245007200103300001200175490000700187       2015                            d  c08/20151 aA. Chael1 aS. Doeleman1 aM. D. Johnson00aImaging Black Hole Magnetic Fields with the Event Horizon Telescope  a22583500 v22