  In the present work, we have extended a weak coupling theory [A. Bakhshandeh,
A. P. dos Santos and Y. Levin Phys. Rev. Lett 107, 107801 (2011)] for systems
with added 1:1 electrolyte. To study the accuracy of the developed theory, we
compare its numerical predictions with Monte Carlo simulation data and a recent
theory which accounts for the surface polarization. A very good agreement is
found for the case of monovalent electrolytes, up to very high salt
concentrations and different colloidal charges
