Dear ALL i would like to ask in general if there is a suggested certain completeness cutoff for the higher resolution shell. for example; the following are the values for the 4 higher resolution shells Shell Lower Upper Average Average Norm. Linear Square limit Angstrom I error stat. Chi**2 R-fac R-fac Rmeas Rpim CC1/2 CC* completeness 1.53 1.50 2.5 1.2 1.2 0.706 0.680 0.596 0.855 0.510 0.547 0.841 73.6 1.50 1.47 2.3 1.1 1.0 0.745 0.742 0.629 0.967 0.613 0.468 0.798 55.3 1.47 1.44 2.0 1.0 1.0 0.725 0.775 0.644 0.000 0.694 0.395 0.752 52.4 1.44 1.41 1.9 0.8 0.8 0.689 0.946 0.681 0.000 0.883 0.371 0.736 33.9 All reflections 44.8 2.5 2.3 0.638 0.044 0.029 0.052 0.028 my question in other word if all statistics for the highest resolution shell are reasonable, good I/sigma, R-fac, ........, CC1/2, ..etc but the completeness is just say 20 or 30, what is allowable completeness limit for the highest resolution shell, 70, 80 or 90??? regardsTK_Dawod