> 0.3 contour -Z0.3
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> 0.6 contour -Z0.6
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> 0.9 contour -Z0.9
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> 1.2 contour -Z1.2
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> 1.5 contour -Z1.5
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> 1.8 contour -Z1.8
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> 2.1 contour -Z2.1
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> 2.4 contour -Z2.4
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