Reconstructing the projected gravitational potential of Abell 1689 from X-ray measurements Céline Tchernin, Charles L. Majer, Sven Meyer, Eleonora Sarli, Dominique Eckert and Matthias Bartelmann A&A, 574 (2015) A122 Published online: 05 February 2015 DOI: 10.1051/0004-6361/201323242