Three dimensional structure of a regular sunspot from the inversion of IR Stokes profiles S. K. Mathew, A. Lagg, S. K. Solanki, M. Collados, J. M. Borrero, S. Berdyugina, N. Krupp, J. Woch and C. Frutiger A&A, 410 2 (2003) 695-710 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20031282