Elongated structures on the scale 2a = 1′ of the anisotropic wavelet transform in the tracer indicated in the upper right corner of each frame are shown with the solid contour drawn at 20% of the maximum intensity in that tracer in the arm region. Red dashes, representing the B vectors of the polarized radio emission at λ6 cm, with length proportional to the polarized intensity, are shown in the same regions.
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