As negotiators prepare to start drafting a final deal to curb Iran’s atomic activities, conflicting U.S.-Iran takes on key elements mean tough work ahead of a June 30 deadline. Though six world powers remain at the bargaining table, the real negotiating is between the two nations. Ahead of the resumption of expert-level negotiations early next week, here’s a look at key areas of U.S.-Iran agreement and disagreement, based on fact sheets made available to the media by Tehran and Washington and comments from their officials. —- WHAT THEY AGREE ON – Iran will halve the number of working centrifuges, machines that can spin uranium gas into levels used for nuclear arms. That will leave about 5,000 centrifuges, enriching to levels substantially below weapons-grade. – Iran will re-engineer a nearly finished reactor to cut its production of plutonium and reduce the proliferation threat it would have posed. […]