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\section{Results}  The results of isotopic data for bulk  and clumped isotope analysis of all samples and standards are reported in Table 1 and plotted in Figure 5 and 6. The variation in isotope values and T($\Delta$_{47}) along the growth direction of the evin vein  are plotted in Figure 5(a) and (b) for DLR7 and DLR7(i) respectively. Because the The  two sections were cut at different locations across the vein and have been measured with respect to different zero datums. Thus  we don't a-priori  expect a direct correlation between them. There are, however, similarities. DLR7 has a distinctive, repeating asymetric saw-tooth pattern along the growth direction that is most marked for $\delta$^{18}O and T($\Delta$_{47}). Four regions of section DLR7, separated by the gray grey  bands in Figure 5(a), are identified. The bands mark negative  step changes in T($\Delta$_{47}) between adjacent samples. areas of the transect.  Each section area  is characterized by a rising temperature from a minimum of 40$^{\circ}$ to a maximum of 90$^{\circ}$C. This pattern is mirrored by antithetic changes in $\delta$^{18}O, falling from a maximum value of -8‰ to a minimum of -10‰_{VPDB}. The pattern of change in $\delta$^{13}C is not so marked or consistent but is still apparent. For example between 10 Unlike for $\delta$^{18}O  and 25mm T($\Delta$_{47})  there is a positive covariation no consistent pattern  of $\delta$^{18}O and variation for  $\delta$^{13}C with an inverse correlation values ranging  between 30 +1.5  and 50mm. +3.8‰_{VPDB}.  In contrast, the asymmetric, sawtooth pattern observed in section DLR7 is not readily apparent in section DLR7i. None-the-less it is still possible to identify regions where there is a marked pattern of variation for both T($\Delta$_{47}) and $\delta$^{18}O, Figure 5(b). Between For example, between  10 and 20, 55 and 60, and 65 and 75mm T($\Delta$_{47}) rises whilst there is an inverse fall in the $\delta$^{18}O value. Between 25 and 50mmin section DLR7i  there is an apparent breakdown in the inverse relationship between T($\Delta$_{47}) and $\delta$^{18}O. In this region temperatures for the most part are greater than 70$^{\circ}$C whilst $\delta$^{18}O remains constant and close to -9.8‰_{VPDB}. We shall return to this apparent lack of variation of $\delta$^{18}O towards the higher temperature range reported here in the discussion.  As with section DLR7 the carbon isotope data does not show a marked covariation with either temperature or oxygen isotope composition. The exception is in the section between 10 composition  and20mm where there is a marked inverse relationship between $\delta$^{13}C and $\delta$^{18}O with a 2‰ positive trend in carbon isotope values matched by a 2‰ negative trend in  the oxygen isotope values. This trend, however, range of measured values  is heavily levered by a single point with $\delta$^{13}C = 1.5‰_{VPDB} identical between +1.5  and $\delta$^{18}O = -7.5‰_{VPDB}. +3.8‰_{VPDB}.