Histograms of all our sample of data. We assume that all the lightcurves with amplitudes below an arbitrary limit are single peaked and those with amplitudes larger than this limit are double peaked. White data correspond to a limit of 0.10 mag, grey data correspond to a limit of 0.15 mag and black data correspond to a limit of 0.20 mag. Dash line is the Maxwellian fit to the distribution with 0.10 mag limit. Grey line is the Maxwellian fit to the distribution with 0.15 mag limit. Black line is the Maxwellian fit to the distribution with 0.20 mag limit.