Circular velocity (row 1), normalized m = 2 Fourier amplitude (row 2) and m = 2 Fourier phase (row 3), inferred from the 3.6 μm (blue) and ICA-corrected (red) potentials for the barred galaxies NGC 1566, NGC 0150, and NGC 4639 (Cols. 1–3). The blue shaded area in the upper panels shows the uncertainty of V_{3.6 μm} associated to a 30% uncertainty in Υ_{3.6 μm}, which is assumed to be radially constant. The red dashed lines correspond to P5-mass maps error bars considering the 0.1 dex uncertainty deduced in Meidt et al. (2012). Circular velocities computed as a function of a [3.6] − [4.5] colour-dependent M/L are also shown.