Star formation rate and sSFR as a funcion of stellar mass and metallicity. In all panels, black markers show the OTELO SFG sample, green empty circles show transitional dwarf galaxies, cyan triangles show VVDS-Ultra-Deep data, blue dots show VVDS-Deep data, and contours in red and grey show the GAMA and local SDSS samples, respectively. Left panel: linear fits to our SFG sample (blue dashed line), VVDS Deep+Ultra-Deep (both selected sub-samples from VVDS, red dashed-line), and the fit from Noeske et al. (2007; black solid line), which is given in the mass range of 10¹⁰ − 10¹¹ M_⊙, and the black dashed line is an extrapolation of their fit down to 10⁸ M_⊙. The grey dashed line shows the linear fit of the local SDSS sample. For clarity we do not plot the estimated dispersions for any fit.