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Fig. 9.

image

Spline fitting of the total efficiency of the telescope + RTF + OSIRIS camera system for CCD1 (red curve) and CCD2 (blue curve), based on the OTELO survey calibration stars and averaged for each slice. The black continuous line is the polynomial fitting from the GTC Cabrera-Lavers et al. (2014) of the values represented by the open black circles, whilst the green steped one represents the efficiency tabulated in the OSIRIS SNR Calculator (http://gtc-phase2.gtc.iac.es/science//OsirisETC/html/Calculators.html). These spectra were in turn used to estimate the total efficiency of the system and its deviations depending on the particular conditions of each individual RTF observation. Overlapping black dots correspond to PSF fluxes in r-, i-, and z-band from SDSS-DR12 for these stars. The flux differences with those from SDSS are within the mean error.

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