| Hotspot | Non-hotspot | P |
Substrate size (mm) | 27 (1) | 25 (3) | 0.607 |
Cover (0 or 1) | 0.4 (0.1) | 0.1 (0.1) | 0.067 |
Temperature (˚C) | 5.0 (0.0) z* | 4.9 (0.0) y* | 0.011 |
Width (m) | 5.1 (0.2) | 4.4 (0.4) | 0.258 |
Depth (m) | 0.3 (0.0) | 0.3 (0.0) | 0.764 |
Velocity (m3/s) | 0.3 (0.0) | 0.3 (0.0) | 0.459 |