Dear All Problem : Distribution of sodium and chloride ions than chlorine fixed place in center of box simulation I wanted to ask which graphs the density of sodium is correct ? Box : 2.65 *2.65 *2.65 nm force field : AMBER99SB-ILDN Number of Na : 10 Number of Cl : 9 Number of Cl fix : 1 Time : 4 ns Water : TIP3P Kind Regard saeed.akbarshahi