APM 08279+5255 light curve composed with the continuum (black dots) and emission-line fluxes, which are scaled in intensity and shifted in time of their JAVELIN lags of 837 and 901 rest-frame days, respectively, to mimic the original continuum light curve that is reverberated by the quasar BLR. Upper panel: continuum and Si IV (red triangles). Lower panel: continuum and C IV (blue crosses). In both panels, a DRW continuum, fitted by JAVELIN to the data with the damping timescale τ_d blocked to that of the continuum fit, is shown superimposed to the light curve (solid line) along with its 1σ error band (dashed lines).