Calibration of the 6302/6301 Stokes V line ratio in terms of the 5250/5247 ratio J. O. Stenflo, M. L. Demidov, M. Bianda and R. Ramelli A&A, 556 (2013) A113 Published online: 06 August 2013 DOI: 10.1051/0004-6361/201321749