Grating parameters of M. robinsoni (N = 19) and M. nigromaculatus (N = 17) scales.

Species	Width of grating	Distance of grating	Effective grating
M. robinsoni	140 ± 20 nm	330 ± 15 nm	3000 lines per mm
M. nigromaculatus	80 ± 20 nm	210 ± 30 nm	4600 lines per mm