First row: 2D synthetic stellar bars constructed from co-added 3.6 μm images of barred galaxies oriented and rescaled with respect to the bars, grouped based on total stellar mass (increasing from right to left). Different surface brightness contours, starting at the bar end and going to brighter (solid lines) and fainter (dotted lines) levels, are displayed. The μ_{3.6 μm} levels are also indicated in units of mag arcsec^-2. The vertical dashed lines delimit the bar major axis. Second row: as in the upper panels, but binning the sample based on revised Hubble type.