Figure 3
From: Carbon isotopic evidence for the catalytic origin of light hydrocarbons
A plot of carbon isotope ratios (‰) for presumed intermediates [S6] and [S7], where δ13C ([S6]) = a δ13C (2-MP) + b δ13C (3-MP) + c δ13C (n-C6) and δ13C ([S7]) = d δ13C (2-MH) + e δ13C (3-MH) + f δ13C (n-C7). Data shown in Table 2. The reported analytical error for δ13C's is ± 0.5‰s (ref. 2). The mean for δ13C ([S6])/δ13C ([S7]) = 1.00 ± 0.02s. For the linear regression, r2 = 0.83, slope = 0.90 and intercept = -2.48.