> 3 contour -Z3
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> 6 contour -Z6
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> 9 contour -Z9
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> 12 contour -Z12
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> 15 contour -Z15
-107.519	18.8800914917	15
-107.502333333	18.8868099276	15
-107.485666667	18.890586298	15
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-107.393636613	18.8625824047	15
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-107.369263163	18.8292568915	15
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-107.36040541	18.7959313783	15
-107.360410104	18.7792686217	15
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-107.559125635	18.7292803519	15
-107.568713974	18.7459431085	15
-107.569	18.7467073895	15
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-107.577588101	18.7792686217	15
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> 18 contour -Z18
-107.502333333	18.8547877371	18
-107.485666667	18.8603365479	18
-107.469	18.8621107704	18
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-107.404601255	18.7459431085	18
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-107.502333333	18.7204193179	18
-107.517243998	18.7292803519	18
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-107.542212159	18.7626058651	18
-107.546254453	18.7792686217	18
-107.546257907	18.7959313783	18
-107.54222194	18.8125941349	18
-107.535666667	18.8255371083	18
-107.533414093	18.8292568915	18
-107.519	18.8446121575	18
-107.517262514	18.8459196481	18
-107.502333333	18.8547877371	18
> 21 contour -Z21
-107.469	18.830026054	21
-107.464270663	18.8292568915	21
-107.452333333	18.8266195985	21
-107.435666667	18.8151240798	21
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-107.433453368	18.7626058651	21
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-107.452333333	18.7485851568	21
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-107.473711155	18.7459431085	21
-107.485666667	18.7485850039	21
-107.502333333	18.7600823831	21
-107.504546875	18.7626058651	21
-107.51193009	18.7792686217	21
-107.511932564	18.7959313783	21
-107.504552785	18.8125941349	21
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-107.473729489	18.8292568915	21
-107.469	18.830026054	21