Dear CCP4 experts, I would like to ask if there is a clear way to distinguish Na+ and HOH molecules in the electron density map. The table I have suggests Na to O distance lies between 2.35 and 2.45 that is very hard to discern the difference of these two candidates. Na+ may have several coordination though (5, 6).
This started from if where the divalent metal locates can be substituted by water or sodium. I would appreciate any valuable suggestions. Best, Young-Jin
