> 3 contour -Z3
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> 6 contour -Z6
-171.8116	51.8273273945	6
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-171.7616	51.8325672225	6
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> 9 contour -Z9
-171.7866	51.802843918	9
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-171.8616	51.7742533766	9
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-171.8116	51.7975832097	9
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-171.7866	51.802843918	9
> 12 contour -Z12
-171.8116	51.7777936357	12
-171.7866	51.7847533731	12
-171.7616	51.7868301392	12
-171.7366	51.7847548381	12
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-171.8116	51.7777936357	12
> 15 contour -Z15
-171.8116	51.7597780841	15
-171.7866	51.767982716	15
-171.7616	51.7711264322	15
-171.7366	51.7679849377	15
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-171.695531261	51.6983054054	15
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-171.8116	51.7597780841	15
> 18 contour -Z18
-171.7866	51.7509232941	18
-171.7616	51.7551137421	18
-171.7366	51.7509262862	18
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-171.8116	51.7258854299	18
-171.793733255	51.7484945946	18
-171.7866	51.7509232941	18