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BSE images of type I porphyritic chondrules analyzed in Paris that are homogeneous in terms of oxygen isotope compositions (C18: POP, C30: PO, C21 and C11: PP). SIMS oxygen three-isotope analysis points are shown by the vertex of the triangles, color-coded for mineral phases (olivine: blue, relict olivine: white, low-Ca pyroxene: green). Δ17O values of individual analyses are indicated.
