Table I

Reproducibility and Robustness of the Didymium Standards

Standard ID	Didymium A				Didymium B
Instrument ID	Instrument A		Instrument B		Instrument A		Instrument B
%T@ wavelength	430 nm	570 nm	430 nm	570 nm	430 nm	570 nm	430 nm	570 nm
Acceptance range	59.78 ± 2.0	21.99 ± 3.1	59.78 ± 2.0	21.99 ± 3.1	61.95 ± 2.0	22.68 ± 3.1	61.95 ± 2.0	22.68 ± 3.1
1	59.94	22.71	60.13	21.62	61.05	23.10	61.39	22.35
2	59.92	22.74	60.09	21.57	61.09	23.09	61.39	22.34
3	59.98	22.70	60.08	21.63	61.10	23.05	61.41	22.36
4	59.94	22.75	60.11	21.63	61.05	23.10	61.43	22.34
5	59.92	22.73	60.13	21.63	61.12	23.09	61.40	22.36
6	59.92	22.73	60.10	21.64	61.15	23.15	61.40	22.37
Mean	59.94	22.73	60.11	21.62	61.09	23.10	61.40	22.35
SD	0.02	0.02	0.02	0.03	0.04	0.03	0.02	0.01
RSDM	0.04	0.08	0.03	0.12	0.06	0.14	0.02	0.05