Overall estimated standard uncertainties of positional parameters based on Maximum likelihood residual. Overall ESU gives an idea about uncertainties in the position of averagely defined atoms (atoms with B-values equal to average B-value) 3 N_a (sigma_X)^{2 = ----------------------------------------------------- 8 pi}2 sum_i {(1/Sigma - (E_o)^{2 (1-m}2)(SUM_AS)s^{2} SUM_AS = (sigma_A)}2/Sigma^{2) N_a = number of atoms Sigma = (sigma_{E;exp})}2 + epsilon (1-{sigma_A)^{2) E_o = normalized structure factors sigma_{E;exp} = experimental uncertainties of normalized structure factors sigma_A = <cos 2 pi s delta_x> SQRT(Sigma_P/Sigma_N) estimated using maximum likelihood Sigma_P = sum_{atoms in model} f}2 Sigma_N = sum_{atoms in crystal} f^{2 f = is formfactor of atoms delta_x = expected error m = is figure of merit of phases of reflection included in summation delta_x expected error s = reciprocal space vector epsilon = multiplicity of diffracting plane summation is over all reflections included in refinement Reference for sigma_A estimation: "Refinement of Macromolecular Structures by the Maximum-Likelihood Method:" G.N. Murshudov, A.A.Vagin and E.J.Dodson,(1997) Acta Crystallogr. D53, 240-255 Reference for ESU_ML estimation: Simplified error estimation a la Cruickshank in macromolecular crystallograpy Murshudov G.N. & Dodson E.J. in the "CCP4 Newsletter on protein crystallography" Number 33 ed. M.Winn}