Table II

Reproducibility and Robustness of the Neutral Density Filters

Standard	0.2 OD filter A						0.2 OD filter B
Instrument	Instrument A			Instrument B			Instrument A			Instrument B
	X	Y	Z	X	Y	Z	X	Y	Z	X	Y	Z
Acceptance Range	61.22 ± 0.8	65.23 ± 0.8	67.3 ± 0.8	61.22 ± 0.8	65.23 ± 0.8	67.3 ± 0.8	61.38 ± 0.8	65.42 ± 0.8	67.49 ± 0.8	61.38 ± 0.8	65.42 ± 0.8	67.49 ± 0.8
1	61.25	65.28	67.35	61.27	65.3	67.41	61.16	65.17	67.25	61.12	65.13	67.23
2	61.23	65.25	67.33	61.26	65.29	67.42	61.20	65.21	67.27	61.11	65.12	67.23
3	61.22	65.24	67.32	61.29	65.31	67.43	60.90	64.89	66.93	61.12	65.14	67.24
4	61.23	65.24	67.36	61.25	65.28	67.38	60.93	64.93	66.97	61.12	65.14	67.23
5	61.22	65.23	67.33	61.26	65.29	67.39	60.93	64.92	66.97	61.12	65.14	67.23
6	61.23	65.25	67.34	61.26	65.29	67.38	60.94	64.94	66.98	61.11	65.13	67.21
Mean	61.23	65.25	67.34	61.27	65.29	67.40	61.01	65.01	67.06	61.12	65.13	67.23
SD	0.01	0.02	0.01	0.01	0.01	0.02	0.13	0.14	0.15	0.01	0.01	0.01
RSDM	0.02	0.03	0.02	0.02	0.02	0.03	0.22	0.22	0.23	0.01	0.01	0.01