Figure 5:
Double q state.
A linearcombination of 2 states like that shown in Fig. 4 gives us the double q state, the states that are combined are derived from 2
/a*(0,0,0.5) by moving the 0.5 from the z component to the x or y one.
/a*(0,0,0.5) by moving the 0.5 from the z component to the x or y one.