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S. Mgo, The peak maximum is shift from ~ - 85 to -83 ppm with increasing MgO content. spectra were simulated with three individual Gaussian peaks for An-Di. For An-Di glass, the derived chemical shift (? iso ) is -79.9, -86.8 and -95.3 ppm for a possible assignment to Q 2 , Q 3 and Q 4 or Q 4* , respectively. For HPG, the simulation was performed with only two Gaussian peaks and the assignment was made considering that the proximity of Al atoms induces a shift in the ? iso . The derived ? iso is -105.3 and -98.9 ppm with a possible assignment, respectively. For all spectra of a given glass composition, the simulation was conducted simultaneously on the entire dataset