> 2.5 contour -Z2.5
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> 5 contour -Z5
-107.535666667	19.0656813543	5
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> 7.5 contour -Z7.5
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> 10 contour -Z10
-107.535666667	18.9310250611	10
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> 12.5 contour -Z12.5
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> 15 contour -Z15
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> 17.5 contour -Z17.5
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