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Table 2

Systematic uncertainties that contribute to the total uncertainty on the throughput measurements.

Systematics σ T /T

Ambient light in SCALA relative output (daytime clouds) <0.5%
Ambient light in SCALA relative output (daytime clear) <0.4%
Ambient light in nighttime CLAP data <0.2%
Wavelength uncertainty on SCALA relative output <0.021%
SCALA relative output stability <0.7% λ < 4700 Å
<0.02% λ ≥ 4700 Å
Inhomogeneous color illumination of the entrance pupil <0.09%
Stray light in 0.5° beam <0.51%
CLAP integration over time error <0.07%
Optical cross talk in SCALA <0.05%
Optical cross talk in SNIFS <0.1%
SCALA and SNIFS reproducibility 0.3%  for λ ≥ 4000 Å
2%  for λ< 4000 Å
CLAP calibration 0.74%  for λ< 3400 Å
0.32%  for 3400 <λ< 4700 Å
0.18%  for λ ≥ 4700 Å

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