Fraction of bound proteins; L
dependence. The fraction of the bound proteins φ is plotted as the function of free ligands in the system L0 for the pure state. All curves were obtained for P0 = 2. The thickest full line is the mean field result. The thinner full line is obtained using the PARNES method. The dashed curve is obtained by exact diagonalisation of the master equation. Please note that the PARNES curve (thin full line) agrees best with the exact result (dashed line).