> 1 contour -Z1
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> 2 contour -Z2
-174.8474	51.5217660232	2
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> 3 contour -Z3
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> 4 contour -Z4
-174.8224	51.4732925417	4
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> 5 contour -Z5
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> 6 contour -Z6
-174.7974	51.4497873691	6
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> 7 contour -Z7
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