Hi All I was just going through the .help section and website documentation for ordered_solvent. And wonder if somebody could enlighten me as too the meanings of; ordered_solvent { primary_map_type = mFobs-DFmodel secondary_map_type = 2mFobs-DFmodel h_bond_min_mac = 1.8 h_bond_min_sol = 1.8 h_bond_max = 3.2 } peak_search { map_next_to_model { use_hydrogens = False } max_number_of_peaks = None peak_search { peak_search_level = 1 max_peaks = 0 interpolate = True min_distance_sym_equiv = None general_positions_only = False min_cross_distance = 1.8 } What is the difference between the primary and secondary map? Is there away to pick sites in one and remove in another? Eg. pick sites at 3 sigma in FoFc and remove if 1.2 sigma in 2FoFc. I thought h-bonding was generously about 2.4-3.6A so why the 1.8 and 3.2 defaults? Also if use_hydrogens = True, does the refinement use h_bond parameters instead of model_peak_dist and peak_peak_dist parameters, or both? Also what do all of the peak_search parameters do? And finally does anyone have any recommendations for progessively changing the ordered_solvent parameters? In CNS we used to gradually lower the 2FoFc peak picking (and deleting) and increase the bfactor_max for deleting? Thanks Mark