Distribution of the DIG fraction (f(Hα)_DIG/f(Hα)_total) for each galaxy of the sample. Red area represents the cumulative distribution between the upper and lower DIG limits, with a step of 0.05R₂₅, being the solid red lined the mean value. Blue area is the radial distribution of the DIG obtained integrating the flux between rings of width 0.05R₂₅ and with a step of 0.05R₂₅, being the solid blue lined the mean value. R₂₅ is the isophote at the blue brightness of 25 mag arcsec⁻². This parameter is obtained from Hyperleda database.