18πg2\frac{1}{8} \pi \mathrm{g}^{2}81πg2
14πg2\frac{1}{4} \pi \mathrm{g}^{2}41πg2
12πg2\frac{1}{2} \pi \mathrm{g}^{2}21πg2
πg2\pi \mathrm{g}^{2}πg2