> 1 contour -Z1
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> 2 contour -Z2
-179.5704	50.9598138568	2
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> 3 contour -Z3
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> 4 contour -Z4
-179.5454	50.9142292927	4
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> 5 contour -Z5
-179.5204	50.9052714148	5
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> 6 contour -Z6
-179.5454	50.881589208	6
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> 7 contour -Z7
-179.5204	50.8810320915	7
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> 8 contour -Z8
-179.5204	50.8608236643	8
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