Broadness (time interval when the SN light curve is within 0.5 mag from peak) of the SNe and template light curves discussed in Sect. 5.1, and illustrated in Fig. 6. (These values characterize the broadness of the light curve around maximum light.) OGLE-2014-SN-131 is broader than normal SNe Ibc, and than other SNe Ibn, including its spectroscopic match, SN 2010al. It is instead similar to the broad Type Ic SN 2011bm. We include the rapidly-fading Type Ibn LSQ13ccw to illustrate the diversity of light curve parameters for Type Ibn SNe. Both OGLE-2014-SN-131 and SN 2011bm evolve significantly slower than the typical light curve of their respective classes.