Left: relative error in relativistic Debye length using the approximation of Eq. (8). Right: relative error in relativistic Debye length for individual zones in the MESA evolution for a 70 M_⊙ He progenitor as a function of time prior to collapse. Each dot in the figure is a mass element at a specific time step. Only times at which T > 150 keV and mass elements for which weak or intermediate relativistic screening is appropriate are shown.