Residuals after subtracting the ramp and eclipse from the g15 white light curve (black points). Since this data set covers the 5–7 μm range, we fixed the eclipse depth at 0.216% and the central phase at 0.50014. The residuals were binned by six (red diamonds), and a cubic spline interpolation was used to estimate the final sawtooth function at the observed orbital phases (solid red line).