> 0.6 contour -Z0.6
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> 1.2 contour -Z1.2
-171.8116	51.8773215929	1.2
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> 1.8 contour -Z1.8
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> 2.4 contour -Z2.4
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> 3 contour -Z3
-171.8366	51.7748909386	3
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> 3.6 contour -Z3.6
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> 4.2 contour -Z4.2
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> 4.8 contour -Z4.8
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