Figure 4:

Δ¹⁷O values of olivine and pyroxene analyses per individual chondrule. Error bars show external reproducibility (2SD) obtained by analyses of the bracketing standard. Chondrules sorted according to increasing host chondrule Δ¹⁷O values (stars) which are obtained by averaging Δ¹⁷O values of isotopically homogeneous olivine and/or pyroxene analyses after excluding isotopic relicts (triangles). Δ¹⁷O values of relict olivine exceed the variability threshold (grey line; ±0.6‰, mean external precision on bracketing standard, 3SD). Most type I chondrules show host chondrule Δ¹⁷O values in between −6‰ and −4‰ as illustrated by the histogram on the right-hand side of the graph.