Zoom-in of the silicon K-edge. We represent the best fit with a red solid line. We show, in orange, the model obtained byadding secondary Si-bearing dust candidates presented in the text to the best fit. The green dashed line represents the best fit adding the neutral silicon cross section calculated with the COWAN code. We use a data bin size of ~ 0.04 Å, approximately one-third full width half maximum (in other words the energy resolution of the detector).