> 2 contour -Z2
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> 4 contour -Z4
-171.5083	52.0354415291	4
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-171.588404304	51.9509	4
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-171.5333	52.0239058706	4
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-171.5083	52.0354415291	4
> 6 contour -Z6
-171.5083	52.0020067659	6
-171.4833	52.0135171855	6
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-171.4333	52.0207513744	6
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-171.5083	52.0020067659	6
> 8 contour -Z8
-171.4333	52.0022514337	8
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-171.505500389	51.925927027	8
-171.5083	51.931826216	8
-171.516596313	51.9509	8
-171.5083	51.9700421584	8
-171.505541264	51.975872973	8
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-171.4333	52.0022514337	8
> 10 contour -Z10
-171.4583	51.9837702528	10
-171.4333	51.9872839369	10
-171.4083	51.983768019	10
-171.391100659	51.975872973	10
-171.3833	51.9667781636	10
-171.374178544	51.9509	10
-171.3833	51.9350478549	10
-171.391129099	51.925927027	10
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-171.4333	51.914515774	10
-171.4583	51.9180349089	10
-171.475466485	51.925927027	10
-171.4833	51.935059302	10
-171.492413975	51.9509	10
-171.4833	51.9667667003	10
-171.475494905	51.975872973	10
-171.4583	51.9837702528	10
> 12 contour -Z12
-171.4583	51.9593314689	12
-171.4333	51.9680474227	12
-171.4083	51.9593257935	12
-171.400874776	51.9509	12
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-171.4333	51.9337549949	12
-171.4583	51.9424729195	12
-171.46572604	51.9509	12
-171.4583	51.9593314689	12