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On a plot of $\delta$^{13}C versus $\delta$^{18}O the restricted range of isotopic composition of the vein is highlighted with $\delta$^{13}C and $\delta$^{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 and $\delta$^{13}C are decoupled with a horizontal band of data covering a range of $\delta$^{18}O values between -8 and -10‰_{VPDB} and little or no variation in $\delta$^{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 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})is evident.  As suggested by Whilst  the data plotted in lowest temperature vein calcite does have the lowest $\delta$^{13}C value (32$^{\circ}$C and 1.6‰_{VPDB} there is no overall correlation between temperature and carbon isotopic composition,  Figure 5 6(b). In contrast  there is a marked clear  inverse covariation between T($\Delta$_{47}) and $\delta$^{18}O. At A change in precipitation temperature from 30$^{\circ}$ to 100${\circ}$C is accompanied by a near 3‰ decrease in  the lowest measured temperatures $\delta$^{18}O value  of30-45^{o}C  the vein calcite from -7 to -10‰_{VPDB}, Figure 6(c).  Using the measured T{$\Delta$_{47}) and  $\delta$^{18}O value values we have calculated the composition  of the fluid that is in isotopic equilibrium with the samples of vein calcite. For this we used the Kim and O'Neill (1996) calibration of the calcite-water fractionation factor. The data plotted in Figure 6(d) show a marked linear covariation with data for the two sections DLR7 and DLR7(i) being the same within measurement error. At the high temperature end the  calcite is in equilibrium with water at 100-110$^{circ}$C and having an enriched $\delta$^{18}O value close to +6‰_{VSMOW}. The low temperature end (30-40$^{circ}C$) is characterized by more negative values of $\delta$^{18}O  between -7 -2  and -8‰_{VPDB}. This decreases towards -10‰_{VPDB} at the highest temperatures. -4‰_{VSMOW}.