In further experiments, I think that the problem is not that the SVG was not smoothed (indeed, I found that when drawing lines that I usually wanted to turn off anti-aliasing by setting shapeRenderingto crisp-edges, see this question ), since I wanted even more smooth edges on their circles than the smoothing provided.
To achieve this in Raphaël.js, you can change the colors filland strokeseparately. For example, on a white background, setting stroketo a lighter color than fillprovides the desired effect.
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