“…They published ep → enπ + cross sections with transverse-longitudinal separation, at Q 2 = 1.60 and 2.45 GeV 2 [14] and Q 2 = 2.15 and 3.90 GeV 2 [15], in the valence region (x Bj 0.3), and above the resonance region (W > 2 GeV). As we evoked in sub-section 5.2.1, Regge based models such as VGL [19,20,18] describe really well the longitudinal cross section. In contrast with this, the Regge predictions given by the previously cited models disagree by more than one order of magnitude with the measured transverse cross section, and this disagreement increases with Q 2 .…”