Figure 6.

Line profile comparison between D-string (upper plots, blue line) and sample 1 (a) and 2 (b) surfaces (black lines). The horizontal lines are the average of the hair profiles, and the curved lines correspond to the section of a cylinder of the D-string diameter. (c–e) Profile extraction lines for sample 1 (c), the D-string (d), and sample 2 (e). Insets in pictures c and e are the 0.5 × 0.5 µm⁻¹ central areas of the corresponding two-dimensional fast Fourier transforms at the same intensity contrast. White arrows indicate frequencies associated with 9 µm vertical wavelengths in both cases. All white scale bars are 20 µm.