Number of galaxies as a function of their bar modulus in the OSU sample. The upper left panel includes all galaxies, while the three others include only the SA, SAB, and SB families. In each panel the solid line corresponds to the values obtained for all the images irrespective of the filter used. We also separate the values for the galaxies studied using the B filter (blue) and H filter (red). The scales for the ordinate are not the same for all panels. The vertical arrows indicate the mean value for each population, while the length of the horizontal arrows indicate the value of the sigma of the distribution.