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Fig. S1: Garnet-biotite gneiss T−X pseudosection with varying ferric iron content (O) from the XRF measured value of 0.39 (X=0) to 0.01 (X=1). Note that higher X values in this diagram actually correspond to lower XFe2O3 in the rock. A mid value of X=0.7 (black line) was selected for the final P-T diagram.