Substitution coefficient Q to calculate loss factor by circulating currents

Definition for flat arrangement is according to publication IEC 60287-1-1 clause 2.3.3

Definition for rectangular arrangement is according to publication 'General Calculations Excerpt from Prysmian Wire and Cable Engineering Guide' (2015)

Symbol
$Q_X$
Formulae
$X_e-\frac{X_m}{3}$flat
$X_e-\frac{X_m}{6}$rectangular