> 2 contour -Z2
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> 2 contour -Z2
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> 2 contour -Z2
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> 4 contour -Z4
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> 6 contour -Z6
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> 8 contour -Z8
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> 10 contour -Z10
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-171.761863318	51.917872973	10
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-171.720564922	51.9680621622	10
-171.7165	51.971911252	10
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-171.6165	52.0433729143	10
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-171.5665	52.0670444146	10
-171.563075085	52.0684405405	10
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-171.4665	52.099922371	10
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-171.4165	52.1106224569	10
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-171.360310141	52.1186297297	10
-171.3415	52.1205694961	10
> 12 contour -Z12
-171.3165	52.0201838485	12
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-171.0165	51.9622215052	12
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-170.955529978	51.917872973	12
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-170.904562365	51.8425891892	12
-170.897921061	51.8174945946	12
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-171.4665	51.5991543465	12
-171.4915	51.6100595909	12
-171.504982519	51.6167378378	12
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-171.5915	51.6827808713	12
-171.599580775	51.6920216216	12
-171.616499411	51.7171162162	12
-171.6165	51.7171174421	12
-171.628038864	51.7422108108	12
-171.634881073	51.7673054054	12
-171.637209969	51.7924	12
-171.635085489	51.8174945946	12
-171.628440536	51.8425891892	12
-171.617076389	51.8676837838	12
-171.6165	51.8685936789	12
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-171.5915	51.902896671	12
-171.577465457	51.917872973	12
-171.5665	51.9274563947	12
-171.547016837	51.9429675676	12
-171.5415	51.9467367926	12
-171.5165	51.9622268413	12
-171.505903681	51.9680621622	12
-171.4915	51.9751574119	12
-171.4665	51.9859821078	12
-171.447288631	51.9931567568	12
-171.4415	51.9951581595	12
-171.4165	52.0026136247	12
-171.3915	52.008790965	12
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-171.3415	52.0175500644	12
-171.33501457	52.0182513514	12
-171.3165	52.0201838485	12
> 14 contour -Z14
-171.3415	51.896016353	14
-171.3165	51.9014006554	14
-171.2915	51.9046000773	14
-171.2665	51.905663313	14
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-171.2165	51.9014006554	14
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-171.180797324	51.8927783784	14
-171.1665	51.8873799363	14
-171.1415	51.875096875	14
-171.129270362	51.8676837838	14
-171.1165	51.8569496894	14
-171.102086972	51.8425891892	14
-171.0915	51.8248800884	14
-171.08762599	51.8174945946	14
-171.083271728	51.7924	14
-171.087722054	51.7673054054	14
-171.0915	51.7601440879	14
-171.102271715	51.7422108108	14
-171.1165	51.7280453853	14
-171.12949752	51.7171162162	14
-171.1415	51.7098284185	14
-171.1665	51.6975110699	14
-171.18099072	51.6920216216	14
-171.1915	51.6888281054	14
-171.2165	51.6834194447	14
-171.2415	51.6802030796	14
-171.2665	51.6791357154	14
-171.2915	51.6802041185	14
-171.3165	51.6834194447	14
-171.3415	51.6888291239	14
-171.352004419	51.6920216216	14
-171.3665	51.6975133825	14
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-171.403504871	51.7171162162	14
-171.4165	51.7280490436	14
-171.430724684	51.7422108108	14
-171.4415	51.760151922	14
-171.445273393	51.7673054054	14
-171.449723146	51.7924	14
-171.445368842	51.8174945946	14
-171.4415	51.8248716791	14
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-171.403730797	51.8676837838	14
-171.3915	51.8751016886	14
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-171.35219907	51.8927783784	14
-171.3415	51.896016353	14