> 0.5 contour -Z0.5
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> 0.5 contour -Z0.5
-169.2348	52.7938404621	0.5
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> 1 contour -Z1
-169.4598	52.7437438753	1
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> 1.5 contour -Z1.5
-169.4098	52.7130814041	1.5
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> 2 contour -Z2
-169.4098	52.6870328081	2
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> 2.5 contour -Z2.5
-169.4098	52.6669068437	2.5
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-169.4348	52.6475199097	2.5
-169.419180993	52.6618178082	2.5
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> 3 contour -Z3
-169.4098	52.6440380972	3
-169.3848	52.6577326828	3
-169.3598	52.6616447838	3
-169.3348	52.6577292372	3
-169.3098	52.6440417556	3
-169.302171568	52.6368726027	3
-169.302188468	52.6119273973	3
-169.3098	52.6047746691	3
-169.3348	52.5910743654	3
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-169.4174072	52.6119273973	3
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> 3.5 contour -Z3.5
-169.3848	52.6387186607	3.5
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-169.3848	52.6387186607	3.5