The AMIGA sample of isolated galaxies - V. Quantification of the isolation S. Verley, S. Leon, L. Verdes-Montenegro, F. Combes, J. Sabater, J. Sulentic, G. Bergond, D. Espada, E. García, U. Lisenfeld and S. C. Odewahn A&A, 472 1 (2007) 121-130 Published online: 26 June 2007 DOI: 10.1051/0004-6361:20077481