Normalized radial mean intensity profile for the two bar lanes of strongly barred PHANGS galaxies. The corresponding average radial noise at 3σ is shown (grey dashed line). The first (red dotted vertical line) and last (blue dashed vertical line) intersection of the bar lane emission with 3σ, referred to as r_bl, min and r_bl, max respectively, provides the minimum and maximum bar lane length. The yellow solid line indicates the bar radius r_max. For most galaxies, the central region is masked out (grey shaded area).