> 0.9 contour -Z0.9
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> 1.8 contour -Z1.8
-169.6364	52.831863273	1.8
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> 2.7 contour -Z2.7
-169.6114	52.8076214249	2.7
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-169.6114	52.8076214249	2.7
> 3.6 contour -Z3.6
-169.6114	52.7832039163	3.6
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> 4.5 contour -Z4.5
-169.5864	52.7785344519	4.5
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> 5.4 contour -Z5.4
-169.5864	52.7596812224	5.4
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-169.5364	52.7774628104	5.4
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> 6.3 contour -Z6.3
-169.5614	52.7594914706	6.3
-169.5364	52.7645855407	6.3
-169.5114	52.7594913421	6.3
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-169.5614	52.7594914706	6.3