Figure 3: Plot of log Kex± versus log Kex±S for all the MPic2-L extraction system. The regression analysis gave the straight line (- − -) of log Kex± = 0.81 × log Kex±S + 2.07 with R = 0.998. The label log Kex±S on the abscissa is identical to log Kex±S(found) in Table 4.