Measured isotopic ratios of Si plotted in δ-notation depicting deviations in permil (‰). Left: individual δ²⁹Si vs. δ³⁰Si ratios (red points) and average (black point). Also shown is the expected line from mass dependent fractionation (black dash-dotted line) and a line through the origin and average (black solid line, slope ~0.68) with error (gray area, see text). Right: data points showing individual δ²⁹Si vs. δ¹³C in carbon monoxide and the black solid line the average δ¹³C = 34‰ with error (gray area, see text). The black dashed lines indicate the corresponding reference values in both plates from McSween & Huss (2010). Below and on the left side are the histograms of the individual measurements.