> 4 contour -Z4
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> 4 contour -Z4
-174.956650093	50.5161	4
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> 4 contour -Z4
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> 4 contour -Z4
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> 8 contour -Z8
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> 12 contour -Z12
-176.045	51.9143781936	12
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> 16 contour -Z16
-175.995	51.7895766273	16
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> 20 contour -Z20
-175.995	51.6882562145	20
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> 24 contour -Z24
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> 28 contour -Z28
-175.895	51.465515081	28
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-175.895	51.465515081	28