> 4 contour -Z4
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> 8 contour -Z8
-176.1058	51.7708765152	8
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> 12 contour -Z12
-176.1058	51.7251472343	12
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> 16 contour -Z16
-176.1058	51.6959974492	16
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> 20 contour -Z20
-176.1058	51.6766229698	20
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> 24 contour -Z24
-176.0808	51.6694831105	24
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-176.08218076	51.59444	24
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-176.0808	51.6694831105	24
> 28 contour -Z28
-176.0808	51.6513991564	28
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-176.092753005	51.64412	28
-176.0808	51.6513991564	28