Fig. 1.
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Example r-band galaxy images with spiral arm strength (2 + log sarm) increasing from left to right and top to bottom. The inner circle of 3″ denotes the size of the SDSS fiber. The outer ellipse at a semi-major axis of R90 illustrates the measured mean ellipticity and PA. The ID in the NSA catalog and the arm strength are presented in the top-left corner.
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