Figure 2.

Statistical analysis of Tillandsia landbeckii patterns alignment. (a) Photograph of Tillandsiales in the north of Chile (courtesy of Nicolás Lavandero, some rights reserved (CC BY https://creativecommons.org/licenses/by/4.0/)). (b) Schematic representation of nonreciprocal feedback for fog-dependent plants. (c) Slope orientation map of a vegetation pattern patch, where the colours show different orientations. The inset shows the angle ${\gamma }_{\mathit{slope}}$ generated by the slope gradient. (d) Angle of the banded pattern with respect to the east axis. The inset illustrates the angle, ${\gamma }_{\mathit{pattern}}$, which the banded pattern forms with respect to the horizontal axis. (e) Slope gradient streamlines for a patch of Tillandsia landbeckii. The colours in the curves account for the height h. $\mathrm{\Delta }\theta$ stands for the angle between the vegetation band and the topography gradient. (f) $\mathrm{\Delta }\theta$ distribution of the banded pattern and the direction of the slope. (g) Representation of the direction of fog propagation (wind) for a vegetation pattern patch. $\mathrm{\Delta }\varphi$ accounts for the orientation angle between the vegetation band and wind. (h) $\mathrm{\Delta }\varphi$ distribution histogram between wind direction and the vegetation banded pattern. $O_l$, H, and $O_r$ account for the oblique left, horizontal, and oblique right pattern.