Figure F23. Major element compositions vs. MgO for basalts from Holes 1155A and 1155B compared with Southeast Indian Ridge glasses from Segment B5. X-ray fluorescence (XRF) and ICP-AES data for splits of a single whole-rock powder are shown on all plots. Two points represent each type of analysis for one sample. Only the average XRF or ICP-AES analyses reported in Table T3 are plotted. The analytical bias between XRF and ICP-AES is most pronounced for Na₂O.