Intercept (upper panel), slope of the luminosity-metallicity (middle panel), and slope of the mass-metallicity relation (lower panel) as a function of time. The open symbols show results using gas-phase metallicities from literature. The filled symbols show data from LCID dwarfs. The data obtained from M_B magnitudes are shown as triangles. The squares show results from stellar masses. The linear fits to the results are overplotted. The dashed lines show the uncertainties of the fit in each case. The vertical axis of the middle panel has been inverted to represent the same behavior as the others panels.