Zoom-in on the magnesium (in the top panel) and silicon K-edge (in the bottom panel) for GX 3+1. The HEG and MEG data are respectively shown in light and dark grey. We show the fit of a dust mixture without any olivinic compounds. In particular the dust counterpart consists of c-enstatite (~ 35%), c-En60Fs40 (~ 15%), a-quartz (~ 50%), and c-quartz (< 1%). We note the large residuals (up to ~15σ) in both edges.