Table A1.

R-Square and RMSE values in linear model fit between ∆_{245, ultrapure} and ∆_{i, ultrapure}.

Wavelength	R-Sq.	RMSE	Wavelength	R-Sq.	RMSE	Wavelength	R-Sq.	RMSE
200	0.96	0.011	215	0.971	0.004	230	1	0.001
200.5	0.958	0.011	215.5	0.974	0.004	230.5	1	0.001
201	0.957	0.01	216	0.977	0.004	231	1	0.001
201.5	0.955	0.009	216.5	0.979	0.004	231.5	1	0.001
202	0.954	0.009	217	0.982	0.004	232	1	0.001
202.5	0.952	0.008	217.5	0.983	0.004	232.5	1	0.001
203	0.95	0.008	218	0.985	0.003	233	1	0.001
203.5	0.948	0.008	218.5	0.987	0.003	233.5	1	0.001
204	0.946	0.007	219	0.989	0.003	234	1	0.001
204.5	0.944	0.007	219.5	0.99	0.003	234.5	1	0.001
205	0.942	0.007	220	0.991	0.003	235	1	0.001
205.5	0.94	0.007	220.5	0.992	0.003	235.5	1	0
206	0.938	0.007	221	0.993	0.003	236	1	0
206.5	0.937	0.007	221.5	0.994	0.003	236.5	1	0
207	0.936	0.006	222	0.995	0.003	237	1	0
207.5	0.936	0.006	222.5	0.996	0.002	237.5	1	0
208	0.937	0.006	223	0.996	0.002	238	1	0
208.5	0.938	0.006	223.5	0.997	0.002	238.5	1	0
209	0.939	0.006	224	0.997	0.002	239	1	0
209.5	0.94	0.006	224.5	0.998	0.002	239.5	1	0
210	0.942	0.005	225	0.998	0.002	240	1	0
210.5	0.944	0.005	225.5	0.998	0.002	240.5	1	0
211	0.947	0.005	226	0.999	0.002	241	1	0
211.5	0.95	0.005	226.5	0.999	0.002	241.5	1	0
212	0.953	0.005	227	0.999	0.002	242	1	0
212.5	0.956	0.005	227.5	0.999	0.002	242.5	1	0
213	0.959	0.005	228	0.999	0.001	243	1	0
213.5	0.963	0.005	228.5	0.999	0.001	243.5	1	0
214	0.966	0.004	229	0.999	0.001	244	1	0
214.5	0.969	0.004	229.5	1	0.001	244.5	1	0