Forward period spacing versus periods for the MLT case and log T_eff = 5 when the Ledoux B term has been artificially suppressed in different regions and does not remain null in the regions specified by the different subscripts of B. The only exception is where B has been suppressed for the whole model (bottom), labeled as B = 0. We see that, when B is only considered not-null in the regions of peaks of the C-O profile, several periods are affected, with the most important contributions being for the periods from 1700 s and higher (top).