Predicted sky brightness for the 16 NB118 filters as function of a hypothetical filter wavelength shift Δλ with respect to the filter curves as predicted based on laboratory measurements. The results from 3 models of the sky emission spectrum are shown: solid orange line: model 1 (Gemini Observatory, theoretical), dotted green line: model 2 (Sullivan & Simcoe 2012), dashed blue line: model 3 (see text). The predictions are based on sky continuum and emission lines near the central passband of the filters; possible red-leaks are not included. The horizontal grey line marks a representative value for the observed NB118 sky brightness in the given filter. The vertical grey line marks the wavelength shift to the red of about 3.5 nm that we infer from NB118 observations of emission line objects with spectroscopic redshifts. The mean filter wavelength λ0 (Eq. (6)) as predicted based on laboratory measurements is given on the panel.
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