Figure 1.

(a) Fluorescence microscopy image of a GUV (∼18 μm diameter). The thin red line denotes the traced 2D equatorial contour. r and θ are the polar coordinates used (with the origin in the contour center). (b) Example of a fluctuation spectrum, showing the dependence of the mean-squared fluctuation amplitudes, $\langle {\delta }_n^2\rangle$, on the mode number, n. The red line is the fit to Eq. 2 for the higher modes. To see this figure in color, go online.