> 3 contour -Z3
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> 6 contour -Z6
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> 9 contour -Z9
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> 12 contour -Z12
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> 15 contour -Z15
-175.2329	51.3506583502	15
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> 18 contour -Z18
-175.1829	51.3339695576	18
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-175.1829	51.3339695576	18
> 21 contour -Z21
-175.1829	51.307013976	21
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-175.065609318	51.22244	21
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-175.200238037	51.29756	21
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> 24 contour -Z24
-175.1829	51.2766874845	24
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-175.1829	51.2766874845	24