> 0.6 contour -Z0.6
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> 1.2 contour -Z1.2
-169.4086	52.8133125563	1.2
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> 1.8 contour -Z1.8
-169.3836	52.789440414	1.8
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-169.3836	52.789440414	1.8
> 2.4 contour -Z2.4
-169.3836	52.7687110831	2.4
-169.3586	52.7754821158	2.4
-169.3336	52.7774128569	2.4
-169.3086	52.7754805984	2.4
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-169.3836	52.7687110831	2.4
> 3 contour -Z3
-169.3586	52.7606400116	3
-169.3336	52.7637142445	3
-169.3086	52.760637612	3
-169.297732831	52.7566561644	3
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> 3.6 contour -Z3.6
-169.3586	52.7459918353	3.6
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