Table 1.

Directional topography gradient features.

Position (mm)	0	1	2	3	4	5	6	7	8	9	10
Wavelength (μm)	1,324	1,520	1,780	2,043	2,320	2,680	3,219	3,889	4,820	6,373	9,935
Amplitude (μm)	0,132	0,176	0,243	0,325	0,391	0,488	0,621	0,780	1,015	1,324	2,169