In order to compute this distribution in the computer, discretization is compulsory. For this we consider a Basis-Set-Ansatz (BSA), particularly we consider a Gaussian-Basis-Set. This theory is broadly known as the Configuration Interaction (CI). And like the full Schrödinger equation the theory is linear and is solved via Exact-Diagonalization (ED) of the Full-CI (FCI) Hamiltonian. The full-CI is an approximation of the full-SE (SE), for a finite basis set, whereas the SE is the idealistic equation describing the structure on the continuum (an infinite basis set).