index the pattern [i.e., determine the planes (hkl) that give rise to the different peaks]. in the process determine the crystal system (i.e., triclinic, monoclinic, trigonal, hexagonal, orthorhombic, tetragonal, or cubic) and the space lattice (i.e., p, i, a (or b or c), f, or r). (b) determine the lattice parameter(s) of the compound (using any appropriate technique of your choice discussed in the book or during lectures in class). comment on the level of significance of your lattice parameter determination [i.e., discuss the error of the determined lattice parameter].