(3) P +,P -. In Equation , the relevant diagram depends on the physical arrangement of the particles through the factors Θ i ; these factors establish the criteria for each diagram, such that e.g. Θ 1 = (1 -θ s-1,s -1 )θ s,s (1 -θ s+1,s +1 ) indicates that there is only a single paired set of charges, locally. The index indicates the number of paired set of charges in a run, such that: