Example of a diagnostic figure used to determine the number of stellar components for each galaxy. The plot represents the best fit using three components (bulge, bar, and disc) for the r-band image of UGC 11228. Similar plots were created for the g- and i-band to check for consistency. Top left panel: galaxy image. Top middle panel: best-fitting model of the galaxy image obtained by adding a bulge, a bar, and a disc component. Top right panel: residual image obtained by subtracting the best-fit model from the galaxy image. Bottom left panel: ellipse-averaged surface brightness radial profile of the galaxy (black dots) and best-fit model (cyan solid line). The light contributions of the bulge (dashed red line), disc (dotted blue line), and bar (dotted-dashed green line) are shown. The upper inset shows a zoom of the surface-brightness data and fit with a logarithmic scale for the distance to the center of the galaxy. 1D surface brightness residuals (in mag/arcsec² units) are shown in the bottom sub-panel. Bottom middle panel: ellipse-averaged radial profile of ellipticity of the galaxy (black dots) and best-fit model (cyan solid line). 1D residuals (in percentage) are shown in the bottom sub-panel. Bottom right panel: ellipse-averaged radial profile of position angle of the galaxy (black dots) and best-fit model (cyan solid line). 1D residuals (in percentage) are shown in the bottom sub-panel. The grey shaded areas in the bottom panels represent the measurement errors derived from the ellipse IRAF task when applied to the galaxy image.