Response function of the HAO+CBB instrument. The atmospheric transmission is plotted in black, the transmission of the HAO telescope in blue-solid, the CBB filter in green and CCD response in yellow. The final response of HAO-1 with the CBB filter is plotted in red-dashed along with the Kepler transmission (blue-dashed). The atmospheric transmission line originated from equations for Rayleigh, aerosol and ozone extinction vs. wavelength for Palomar Observatory (Hayes & Latham 1975). Coefficients were adjusted until they agreed with observations of extinction at HAO over a few dates (2018, priv. comm.).
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