Expansion by regions: revealing potential and Glauber regions automatically Bernd Jantzen, AlexanderV. Smirnov and VladimirA. Smirnov Eur. Phys. J. C, 72 9 (2012) 2139 Published online: 07 September 2012 DOI: 10.1140/epjc/s10052-012-2139-2