The energy difference between cut-off energies at which total energy is evaluated in order to estimate the derivative of total energy with respect to the log of basis cut-off energy.
The cut-off energies at which the total energy is calculated, in order to estimate the derivative, will be chosen symmetrically about the chosen cut-off energy for the calculation.
The default value of this parameter is 5 eV.
Only used if finite_basis_corr = ``AUTO''