Results of our analysis of the noise level of the reflectance spectra at wavelengths of 1.150–1.255 μm. The observed areas on Europa are shown in the top insets. Close-up view of the reflectance spectra fitted by polynomial regression lines of a cubic function at (a) 111° ± 25°W, 38° ± 16°S, (b) 160° ± 9°W, 3° ± 15°N, and (c) 256° ± 5°W, 15° ± 14°N. Differences between the reflectance and polynomial regression lines of the reflectance as a function of wavelength at (d) 111° ± 25°W, 38° ± 16°S, (e) 160° ± 9°W, 3° ± 15°N, and (f) 256° ± 5°W, 15° ± 14°N. The 1σ noise levels are calculated at 1.79 × 10⁻³, 2.39 × 10⁻³, and 3.04 × 10⁻³, respectively.