Figure 4

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The effect of truncated cone and hemispherical cavities on the enhancement factor with delay time, (a) truncated cone cavities of different diameters of 2 mm height, (b) truncated cone cavities of different diameters of 3 mm height, (c) hemispherical restraint with a height of 2 mm and a diameter of 4 mm, and (d) hemispherical cavities of different diameters with a height of 1 mm.
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