Co-added 2D bar in magnitude scale with range 17−25 μ_{3.6 μm}(AB) and cropped to a radius ~2r_bar, resulting from the stacking of galaxies classified as SB in B2015 with Hubble types −1 ≤ T ≤ 1 (38 systems). The black lines show the isocontours corresponding to the surface brightness levels 18−21 (solid line) and 21.5−22.5 (dotted line) mag arcsec^-2 with a step of 0.5 mag arcsec^-2. Some of the galaxies used in the stack are shown in the uppermost panels with the bar elliptical isophote and visual bar measurement from HE2015 highlighted in green and blue, respectively.