3.1.19 IBRAV=111 base-centered orthorhombic lattice(B)(底心斜方格子(B))

CELLDM(1) $=a$, CELLDM(2) $=b/a$, CELLDM(3) $=c/a$, $\Omega=abc/2$
$({\bf a}_{1},{\bf a}_{2},{\bf a}_{3})= ({\bf x},{\bf y},{\bf z}) \left( \beg... ...y}{ccc} a/2 & 0 & -a/2 \\ 0 & b & 0 \\ c/2 & 0 & c/2 \end{array} \right)$
$({\bf b}_{1},{\bf b}_{2},{\bf b}_{3})= \frac{2 \pi}{a} ({\bf x},{\bf y},{\bf ... ...\ 0 & \frac{a}{b} & 0 \\ \frac{a}{c} & 0 & \frac{a}{c} \end{array} \right)$