> 1 contour -Z1
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> 2 contour -Z2
-153.1524	58.8126305427	2
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> 3 contour -Z3
-153.1274	58.7864409295	3
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-153.2024	58.7677788826	3
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> 4 contour -Z4
-153.1524	58.7637189619	4
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-153.1024	58.7704948994	4
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> 5 contour -Z5
-153.1524	58.7473008423	5
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> 6 contour -Z6
-153.1274	58.7408455835	6
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> 7 contour -Z7
-153.1274	58.7221412697	7
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-153.1274	58.7221412697	7