and the appropriate constants are a 0 = 0.244257733, a 1 = 0.00974634476, a 2 = −0.00373234996, a 3 = 0.000268678472, a 4 = 0.0015892057, a 5 = 0.00245934259, a 6 = 0.90070492, a 7 = −0.0166626219, T ∗ ∗ = 273.15 K, ρ ρ ∗ ∗ = 1000 kg/m, λ λ ∗ ∗ = 589 nm, λ λ ¯ ¯ IR = 5.432937, and λ λ ¯ ¯ UV = 0.229202.