Histograms of the morphological indexes for the new quasars in the LQAC4. The binsize in abscissa is reduced for the sake of clarity. Each bin refers to the integer range in which it is located (e.g. ). The fractions in ordinate refers to the total number of sources for which each of the nine morphological indexes were determined. Letters B, R, and I refer to the three colours of DSS plates, blue, red, and infrared. The mnemonic after the letters refer to the IRAFA’s DAOFIND morphological index, respectively sharp, sround, and ground.