Thick disks and halos of spiral galaxies M 81, NGC 55 and NGC 300 N. A. Tikhonov, O. A. Galazutdinova and I. O. Drozdovsky A&A, 431 1 (2005) 127-142 Published online: 02 February 2005 DOI: 10.1051/0004-6361:20047042