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Figure 3: Spiral arm pitch angle versus rotation curve shear, showing a strong correlation. The solid squares represent galaxies with data measured by Block et al. [26], the red squares are galaxies from Seigar et al. [27], the blue squares are galaxies from Seigar et al. [28], the cyan square is for Malin 1 [64], the green square is for M31 [34], and the magenta square represents the data for M33 (this paper).