Nature.com article on Enceladus' atmosphere

Nature.com has a few more details on Enceladus' atmosphere in an article by Mark Peplow. Apparently, the magnetometer is able to constrain on of the constinuents as water vapor. In addition, the article constrains the pressure as being similar to that of the atmospheres found around Europa, Ganymede, and Callisto, or 10^-10 bar.