Fig. 4.
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Residual image obtained by subtracting the image in Fig. 1 with the elliptical β model. A Gaussian smoothing with a kernel size of 7 pix was applied (1 pixel = 9.6″). Four regions of interest (NW, SE, SW and NE) are marked. The dashed white lines mark the position of the radial discontinuity. The dashed blue lines mark the position of the giant spiral arm.
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