A few small cavities appear in the interval from 2936.04 to 2936.14 m. Above 2936.722 m, the cavities more than 50 mm3 are very few and the total number of cavities increases downward. The total number of cavities is the greatest between 2936.722 and 2936.921 m and the proportion of cavities larger than 2 mm3 is 0.33 /cm3 in this interval. Below 2936.921 m, the total number of cavities decreases downward slightly.
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