Log plot of C and H2O data for glass beads and melt inclusions in A17 orange and A15 green and yellow picritic glass samples. Orange circles are orange glass melt inclusions; orange squares are orange glass beads. A15 green glass beads are green circles, and yellow beads are yellow diamonds. Red diamonds show a core-to-rim profile in a single yellow glass bead. Decreasing H2O trend of individual glass bead data is interpreted as diffusion-controlled degassing after bead formation. Melt inclusion data show an apparent equilibrium degassing trend of decreasing C with little loss of H2O. Red squares show the composition calculated by adding CO gas from gas bubbles back into melt inclusions (modified after Wetzel et al. 2015).