Absolute magnitude MK and Qd index of non-stellar sources with errors σ(H − K) < 03 as a function of their azimuthal distance Δθ from the phase of the m = 2 FFT component. The radial range used is indicated in the upper right corner and corresponds to the regions occupied by the main symmetric, two-armed spiral pattern. Colors from blue to red indicate in the MK plots the value of Qd, while in the Qd diagrams they show MK as in Fig. 12.
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