Table 2. ‘Conventional’ k-vector coefficients {k}_{j} (i.e. with respect to a basis dual to the conventional basis of ITA) expressed by the ITA k-vector coefficients {k}_{{\rm a}j} (i.e. referred to the conventional ITA basis of {\cal P}_{0}) for the different Bravais lattices in direct space.

Bravais lattice	{k}_{1}	{k}_{2}
mp, op, tp	{k}_{{\rm a}1}	{k}_{{\rm a}2}
oc	{2k}_{{\rm a}1}	{2k}_{{\rm a}2}
hp	{k}_{{\rm a}1}-{k}_{{\rm a}2}	{k}_{{\rm a}2}