EKHI

Curve 1

Temperature K: 298 Wavelength Range, μ: 0.46-0.60 Geometry θ θ' ω': 10° ? 2π Reported Error, %: ±0.5 Composition (weight percent), Specifications and Remarks: 99 pure; vacuum deposited on glass; measured immediately after removed from vacuum chamber; calculated by authors from ρ = 1 - α using an incandescent tungsten lamp as source.

Wavelength / 𝜇m	Reflectance /
0.46	0.89
0.53	0.89
0.57	0.9
0.6	0.9

Curve 2

Temperature K: 298 Wavelength Range, μ: 0.46-0.60 Geometry θ θ' ω': 10° ? 2π Reported Error, %: ±0.5 Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to the atmosphere for 8 days.

Wavelength / 𝜇m	Reflectance /
0.46	0.86
0.53	0.86
0.57	0.85
0.6	0.86

Curve 3

Temperature K: 298 Wavelength Range, μ: 0.46-0.60 Geometry θ θ' ω': 10° ? 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to atmosphere for 8 days.

Wavelength / 𝜇m	Reflectance /
0.46	0.895
0.53	0.895
0.57	0.885
0.6	0.88

The effect of aluminium purity on the reflectivity of evaporated front surface mirrors