Spectra of the calibration stars present in the FoV of OTELO EGS pointing, as is highlighted in Fig. 1. These spectra were used in turn to estimate the total efficiency of the system and its deviations depending on the particular conditions of each RTF observation. As a check on flux consistence, overlapped black dots correspond to PSF fluxes in r-, i-, and z-band from SDSS-DR12 for these stars.
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