Table 1.
Parameter values for each parasol cell mosaic. The number of points and the area of each field was measured from the previous publications (Field & Chichilnisky 2007; Gauthier et al., 2009). RI denotes the nearest-neighbour regularity index (Wassle & Riemann, 1978). σlo and σhi are the low and high noise levels for the hexagonal lattice simulations.
| Hex lattice |
PIPP |
|||||||
|---|---|---|---|---|---|---|---|---|
| Field | N | Area (mm2) |
RI | d (μm) |
σlo | σhi | ϕ (μm) |
α |
| G09 ON | 89 | 1.90 | 8.9 | 157 | 0.12 | 0.23 | 130 | 14.5 |
| G09 OFF | 117 | 2.04 | 9.1 | 142 | 0.11 | 0.23 | 125 | 13.0 |
| F07 ON | 76 | 2.85 | 8.2 | 208 | 0.12 | 0.21 | 183 | 13.0 |
| F07 OFF | 60 | 2.07 | 11.1 | 200 | 0.11 | 0.24 | 162 | 20.0 |