Table 2.

Final Fringe Frequencies^*

Alignment Lines	Design Frequency (cycles/15 mm grating width)	Measured Frequency (cycles/15 mm grating width)
		MTA	MTB	Flight Spare
HeNe Laser (632.8 nm)	−19.3	−14	−17	−19
Ne (630.5 nm)	34.9	39	36	34
Kr (557.0 nm)	41.2	46	44	40
Science Lines		Expected Frequency
Red (630.0 nm)	45.3	50	47	45
Green (557.8 nm)	19.6	24	22	18

^*positive and negative frequencies indicate fringes from wavelengths shorter and longer than Littrow for the respective grating order.