how many and where are the tetrahedral and octahedral voids located in HCPlattice?

In the close packed crystal HCP there are two types of voids tetrahedral and octahedral voids found which are identical in both FCC and HCP structures as the voids are formed between two layers of atoms.The voids in HCP are identical to the ones found in FCC for ideal c/a ratio.Butwhen the c/a ratio is non-ideal then the octahedra and tetrahedra are distorted.Octahedral voids occur in 1 orientation, tetrahedral voids occur in 2 orientations.No.of tetrahedral and octahedral voids in HCP lattice are as follows-