Fig. 2
Position of H II regions and the arms in galaxy NGC 5457 from Cedrés & Cepa (2002). Filled circles are the regions selected for this study and that possibly belong to the arm marked with the continuous line. The dashed lines represent the other arms detected for this galaxy. The dot-dashed line represent the possible location of the co-rotation radius (see Sect. 4.2). North is at the top and east is left.
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