> 3 contour -Z3
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> 3 contour -Z3
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> 3 contour -Z3
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> 3 contour -Z3
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> 6 contour -Z6
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> 9 contour -Z9
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> 12 contour -Z12
-178.6059	51.5493699907	12
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> 15 contour -Z15
-178.6059	51.4485662031	15
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> 18 contour -Z18
-178.5559	51.3744439739	18
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-178.6309	50.9099023936	18
-178.6559	50.9184267051	18
-178.659394113	50.91978	18
-178.6809	50.9285271129	18
-178.7059	50.9403848394	18
-178.714393516	50.9449	18
-178.7309	50.954482473	18
-178.754461166	50.97002	18
-178.7559	50.9710966909	18
-178.7809	50.9915452437	18
-178.784937713	50.99514	18
-178.8059	51.0174499377	18
-178.80837358	51.02026	18
-178.826085948	51.04538	18
-178.8309	51.0546655549	18
-178.838891879	51.0705	18
-178.847232864	51.09562	18
-178.851375161	51.12074	18
-178.851481165	51.14586	18
-178.847550757	51.17098	18
-178.839413837	51.1961	18
-178.8309	51.2131887152	18
-178.826787174	51.22122	18
-178.809232479	51.24634	18
-178.8059	51.2501382486	18
-178.785914272	51.27146	18
-178.7809	51.2759239571	18
-178.7559	51.2962944545	18
-178.755517633	51.29658	18
-178.7309	51.3127596488	18
-178.715428082	51.3217	18
-178.7059	51.3267376834	18
-178.6809	51.338497458	18
-178.660287146	51.34682	18
-178.6559	51.3485061056	18
-178.6309	51.3569494347	18
-178.6059	51.3640096094	18
-178.5809	51.369787652	18
-178.569352764	51.37194	18
-178.5559	51.3744439739	18
> 21 contour -Z21
-178.4809	51.2971066647	21
-178.4559	51.2985099335	21
-178.4309	51.2971057672	21
-178.42777767	51.29658	21
-178.4059	51.2945379927	21
-178.3809	51.2905964563	21
-178.3559	51.2849509969	21
-178.3309	51.2774887613	21
-178.314723072	51.27146	21
-178.3059	51.2677427241	21
-178.2809	51.2550706611	21
-178.266366653	51.24634	21
-178.2559	51.2386920281	21
-178.235153437	51.22122	21
-178.2309	51.2164509169	21
-178.214503342	51.1961	21
-178.2059	51.1796817004	21
-178.201634865	51.17098	21
-178.195534496	51.14586	21
-178.195605188	51.12074	21
-178.201840439	51.09562	21
-178.2059	51.0874113948	21
-178.214833695	51.0705	21
-178.2309	51.0506179669	21
-178.235580717	51.04538	21
-178.2559	51.0282575686	21
-178.266827041	51.02026	21
-178.2809	51.011781888	21
-178.3059	50.9990508848	21
-178.315140732	50.99514	21
-178.3309	50.9892373373	21
-178.3559	50.9817286849	21
-178.3809	50.976046465	21
-178.4059	50.9720777219	21
-178.427789186	50.97002	21
-178.4309	50.9694923944	21
-178.4559	50.9680784556	21
-178.4809	50.969491405	21
-178.484015921	50.97002	21
-178.5059	50.9720777627	21
-178.5309	50.9760471452	21
-178.5559	50.9817256767	21
-178.5809	50.9892389169	21
-178.596665077	50.99514	21
-178.6059	50.9990458107	21
-178.6309	51.0117841988	21
-178.644969005	51.02026	21
-178.6559	51.028261028	21
-178.67622776	51.04538	21
-178.6809	51.05060501	21
-178.696967857	51.0705	21
-178.7059	51.0874191414	21
-178.709957793	51.09562	21
-178.716197271	51.12074	21
-178.716267995	51.14586	21
-178.71016368	51.17098	21
-178.7059	51.1796740142	21
-178.697298341	51.1961	21
-178.6809	51.2164632286	21
-178.676654849	51.22122	21
-178.6559	51.238688608	21
-178.645428365	51.24634	21
-178.6309	51.2550681695	21
-178.6059	51.2677477529	21
-178.597083088	51.27146	21
-178.5809	51.2774871692	21
-178.5559	51.2849539366	21
-178.5309	51.2905954168	21
-178.5059	51.2945374443	21
-178.484026268	51.29658	21
-178.4809	51.2971066647	21
> 24 contour -Z24
-178.5059	51.2035075565	24
-178.4809	51.2084659478	24
-178.4559	51.210101835	24
-178.4309	51.2084641531	24
-178.4059	51.2035091606	24
-178.383803765	51.1961	24
-178.3809	51.1946883233	24
-178.3559	51.177530391	24
-178.348528315	51.17098	24
-178.334423104	51.14586	24
-178.334458432	51.12074	24
-178.348614572	51.09562	24
-178.3559	51.089146791	24
-178.3809	51.0719710667	24
-178.383921039	51.0705	24
-178.4059	51.0631130439	24
-178.4309	51.058142609	24
-178.4559	51.0564991327	24
-178.4809	51.0581408511	24
-178.5059	51.0631140067	24
-178.527871473	51.0705	24
-178.5309	51.071974935	24
-178.5559	51.0891385552	24
-178.563190308	51.09562	24
-178.577338909	51.12074	24
-178.57737603	51.14586	24
-178.563277833	51.17098	24
-178.5559	51.1775397732	24
-178.5309	51.1946843322	24
-178.527988188	51.1961	24
-178.5059	51.2035075565	24