SED of the HD 121617 system (top) and the residuals after subtraction of the best-fit model (bottom). The best model of the star is represented by the brown dashed line, that of the disk by the brown dotted line, and their sum is the brown solid line. The photometric points with their error bars are represented by vertical black symbols. Synthetic photometric points are represented by diamonds. The color of the diamonds corresponds to the instrument used for the observations.