2160 grating replica notes.

2160 lines/mm grating = 2.160 lines/um = 0.46296 um/line

0.46296 = 1
1.3888 = 3
1.8518 = 4
2.3148 = 5
4.6296 = 10
9.2592 = 20

4.630*10^-7 m/line  or  4.630*10^-4 mm/line



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Catalase crystals stained with Ammonium Molybdate

8.75 nm per major "line" (1/2 the Co spacing, see Wrigley...)

There are minor spacings perpendicular to the major lines and these are 6.85 nm apart (average space)