Comparison of time-integrated and peak-flux spectral parameters for the 227 GRBs whose peak spectrum could be fitted with the Band or CPL model (reported in Table 4 and present also in Table 2). Top panel: peak energy. Bottom panel: low-energy spectral index (α). Empty (filled) symbols are GRBs for which the time-integrated and the peak flux spectra have same (different) best fit model. Squares refer to short events and circles to long events.