> 5 contour -Z5
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> 10 contour -Z10
-97.7908333333	37.2355973327	10
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> 15 contour -Z15
-97.8408333333	37.1873938664	15
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-97.8408333333	37.1873938664	15
> 20 contour -Z20
-97.8408333333	37.1575296497	20
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> 25 contour -Z25
-97.8241666667	37.1372496137	25
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-97.8241666667	37.1372496137	25