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