Extended Data Fig. 5: Quantification of the ommatidial viewing direction grids.
From: Eye structure shapes neuron function in Drosophila motion vision
Related to. Fig. 3. a, Ommatidia directions mapped onto a regular hexagonal grid. b, Definitions of aspect ratio and shear angle for a unit hexagon with examples. c, Aspect ratios calculated from ommatidia directions. d, Aspect ratios calculated from medulla columns. e, Distributions of aspect ratio for ommatidia and medulla columns. A comparison of the aspect ratios for a regular hexagonal grid and a regular square grid shows that the arrangement of ommatidia directions is more hexagonal. In contrast, the arrangement of medulla columns is more square-like (hence the different choices of regular grids in a and Fig. 2d). f, Fig. 3f replotted using Mercator projection. g, Vertical rows of ommatidia directions given by the grid structure, using Mercator projection. h, Fig. 3i replotted using Mercator projection. i, The aspect ratio map in c replotted using Mercator projection.
