The higher order terms now can be considered systematically. However, such a task will require significant mathematical exercise and will be considered later. Eq.( ) is the form described by Carter et. al. . For Ar atom, the minima are clear for both g L (r) and g E (r). For Ne, such clear minimum is not pronounced. Therefore, we have chosen the value for µ which minimizes E(µ) for Ar atom. It is clear that the parameter µ is actually system-dependent and therefore is not transferable. A better understanding of system dependence of µ is required if these enhancement factors are to be used for atomic systems. For all our subsequent results, µ = 2.5 for g L (r) and µ = 0.75 for g E (r) have been used irrespective of the systems.