Comparing the ρ and χ class spectra of the microquasar GRS 1915+105 observed with BeppoSAX T. Mineo, M. Del Santo, E. Massaro, F. Massa and A. D’Aì A&A, 598 (2017) A65 Published online: 01 February 2017 DOI: 10.1051/0004-6361/201629657