Performance study of the effective gain of the double phase liquid Argon LEM Time Projection Chamber. (19th March 2015) - Cantini, C.; Epprecht, L.; Gendotti, A.; Horikawa, S.; Periale, L.; Murphy, S.; Natterer, G.; Regenfus, C.; Resnati, F.; Sergiampietri, F.; Rubbia, A.; Viant, T.; et al.