WASHINGTON — Negotiators at the nuclear talks in Switzerland emerged from marathon talks on Thursday with a surprisingly detailed outline of the agreement they now must work to finalize by the end of June.

But one problem is that there are two versions.

The only joint document issued publicly was a statement from Mohammad Javad Zarif, Iran’s foreign minister, and Federica Mogherini, the European Union foreign policy chief, that was all of seven paragraphs.

The statement listed about a dozen “parameters” that are to guide the next three months of talks, including the commitment that Iran’s Natanz installation will be the only location at which uranium is enriched during the life of the agreement.

But the United States and Iran have also made public more detailed accounts of their agreements in Lausanne, and those accounts underscore their expectations for what the final accord should say.