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. 2020 Apr 6;16(4):e1007756. doi: 10.1371/journal.pcbi.1007756

Fig 9. Estimated second principal curvatures of the spine geometries.

Fig 9

The signed second principal curvature, corresponding to the minimum curvature at each mesh point, is estimated using GAMer 2. Color bars correspond to curvature values with units of μm-1. We have adopted the sign convention where negative curvature values refer to convex regions. Geometries are A) single spine model, left: plasma membrane, right: endoplasmic reticulum; B) two spine model, left: plasma membrane, right: endoplasmic reticulum; and C) plasma membrane of the dendritic branch model. Scale bars: full geometries 2 μm, inlays: 200 nm. Curvature schematic modified from Wikipedia, credited to Eric Gaba (CC BY-SA 3.0).