Correlated spectra (black filled circles) and best fit curves (solid red line) of DG Tau at different projected baselines and in different epochs. The rows are categorized by approximate size of the observed baseline (top: short baseline, middle: intermediate baseline, bottom: long baseline). Gray shading indicates the level of total calibration uncertainties, while black error bars represent the random point-to-point uncertainties (see Appendix A for more details on error calculation).