> 2 contour -Z2
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> 4 contour -Z4
-179.6378	51.0166560881	4
-179.6128	51.0209580559	4
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-179.5628	51.0209578363	4
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-179.6628	51.0106744618	4
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-179.6378	51.0166560881	4
> 6 contour -Z6
-179.6128	50.9922603588	6
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-179.5628	50.9922600632	6
-179.553539668	50.9901052632	6
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-179.6128	50.9922603588	6
> 8 contour -Z8
-179.6378	50.9666865858	8
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-179.5878	50.976734262	8
-179.5628	50.974434045	8
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-179.5628	50.8565695989	8
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-179.6128	50.8565692387	8
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-179.640708095	50.8657631579	8
-179.6628	50.8793057292	8
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-179.674769709	50.9403684211	8
-179.6628	50.9517380154	8
-179.640758083	50.9652368421	8
-179.6378	50.9666865858	8
> 10 contour -Z10
-179.6378	50.9486562191	10
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-179.5878	50.9616147485	10
-179.5628	50.9587784331	10
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-179.514859729	50.9155	10
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-179.5628	50.8722251048	10
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-179.6378	50.9486562191	10
> 12 contour -Z12
-179.6128	50.9447662653	12
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-179.553562419	50.9403684211	12
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-179.534810056	50.9155	12
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-179.553577897	50.8906315789	12
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-179.6128	50.9447662653	12
> 14 contour -Z14
-179.6128	50.919837465	14
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-179.5628	50.9198359676	14
-179.559159217	50.9155	14
-179.5628	50.9111653455	14
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-179.6128	50.9111638436	14
-179.616442201	50.9155	14
-179.6128	50.919837465	14