> 2 contour -Z2
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> 4 contour -Z4
-179.0894	51.2769339203	4
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-179.0894	51.2769339203	4
> 6 contour -Z6
-179.0894	51.2472589354	6
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> 8 contour -Z8
-179.0894	51.2266687293	8
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-179.0144	51.2351367614	8
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> 10 contour -Z10
-179.0394	51.2223998746	10
-179.032317469	51.22142	10
-179.0144	51.2184547178	10
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-179.0394	51.2223998746	10
> 12 contour -Z12
-179.0644	51.2002927839	12
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-179.0144	51.2002978711	12
-179.008205076	51.19634	12
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-179.070581578	51.17126	12
-179.070589676	51.19634	12
-179.0644	51.2002927839	12