> 0.4 contour -Z0.4
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> 0.8 contour -Z0.8
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> 1.2 contour -Z1.2
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> 1.6 contour -Z1.6
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> 2 contour -Z2
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> 2.4 contour -Z2.4
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> 2.8 contour -Z2.8
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