Θ-ln(r) maps of the galaxies showing the variation relative to the radial K_s intensity profile using the projection angles listed in Table 1. A negative gray scale is used from 0.5 (white) to 1.5 (black). A spherical bulge component was fitted and removed before de-projecting the galaxies. The azimuthal angle spans 2π starting from the position angle of the galaxy while the radius begins at 5′′. The two dashed lines indicate the radial range of the symmetric, logarithmic spiral pattern identical to the two ellipses in Fig. A.1. The phase of the m = 2 Fourier component is given by dots.