> 3 contour -Z3
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> 6 contour -Z6
-152.8927	53.7790760425	6
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> 9 contour -Z9
-152.8677	53.7558633851	9
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> 12 contour -Z12
-152.8677	53.7353819575	12
-152.8427	53.7416459014	12
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-152.7927	53.7416445759	12
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-152.8927	53.647504747	12
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-152.8927	53.7221548366	12
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-152.8677	53.7353819575	12
> 15 contour -Z15
-152.8427	53.7266694524	15
-152.8177	53.7294672555	15
-152.7927	53.72666742	15
-152.780007988	53.7223211268	15
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-152.7677	53.653161177	15
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-152.7927	53.6429393751	15
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-152.855352347	53.6472788732	15
-152.8677	53.6531653098	15
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-152.888951605	53.6973070423	15
-152.8677	53.7164579577	15
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> 18 contour -Z18
-152.8427	53.7102560904	18
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-152.7927	53.710253107	18
-152.770075892	53.6973070423	18
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-152.8427	53.6593489006	18
-152.865302553	53.6722929577	18
-152.865317472	53.6973070423	18
-152.8427	53.7102560904	18