The radius of curvature was estimated using the 3D reconstruction of confocal images in Nikon NIS Elements software. Briefly, the y-z plane slices of the z-stack were obtained to visualize the circumference of each 3D-SR-BA. The radii were measured by using a three-point circular fit to the 3D-SR-BA circumference slice in NIS Elements software, as illustrated in fig. S2A.

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