Figure 4
The second virial coefficient B22 as a function of Na2SO4 molar concentration (\({C}_{N{a}_{2}S{O}_{4}}\)) for constant PEG400 volume concentration xPEG = 4.8% V/V in HEPES 0.1 M, pH 7.4. The solid square symbol indicate B22 for a PEG400 concentration of 9.6% V/V without NaCl. The crystallization slot according to ref. 15 is shown in light grey. The solid line is a guide for the eyes.
