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Plotting the bulk isotope compositions composition On a plot  of $\delta$^{13}C versus $\delta$^{18}O  thetwo sections shows the vein to occupy a  restricted range of bulk isotope compositions is highlighted with  $\delta$^{13}C and $\delta$^{18}O values between +1.5 to +3.7‰_{VPDB} and between -7 to -10‰_{VPDB} respectively, Figure 6(a). The plot has There is  a degree of structure, structure in this plot  but given the limited data set it is hard to determine the significance of this. For the most part $\delta$^{18}O and $\delta$^{13}C are decoupled with a horizontal band of data covering a range of $\delta$^{18}O between -8 and -10‰_{VPDB} and little or no variation in $\delta$^{13}C ($\approx$+3.5‰_{VPDB}). There is a A  subset of the data that shows with  a positive 1:1 correlation between $\delta$^{13}C and $\delta$^{18}O and an outlier of three points with relatively high $\delta$^{18}O values (-7 to -8‰_{VPDB}) and low $\delta$^{13}C values (1.5 to 2‰_{VPDB}). 2‰_{VPDB})is evident.  As suggested by the data plotted in Figure 5 there is a marked inverse covariation between T($\Delta$_{47}) and $\delta$^{18)O. At the lowest measured temperatures of 30-45^oC the $\delta^{18}O value of the calcite is between -7 and -8‰_{VPDB}