This diagram shows the ratio (C_{i}/C_{o}) of the concentration (C_{i}) of an element (i) in the liquid of a batch melt (C_{i} = C_{i}^{L}) relative to the total original concentration (C_{o}) in a rock (C_{o} = C_{i}^{Total}) as a function of the fraction (F) of the rock that is melted based on a crystal-liquid distribution coefficient D_{i}. In the batch melting model, the liquid remains in equilibrium contact with the rock as it melts. Fractionation occurs if the liquid is removed after only part of the rock is melted. To change the distribution coefficient D_{i}, enter a number or use the slider. To follow the progress of of the batch melting for a specific D_{i}, move the F slider. To see other partial melting models click on the appropriate check box: (1) Instantaneous removal of melt as it is formed with no interaction of the removed melt with the remaining solid; the C_{i}/C_{o} value is just for the "drop" removed. Or (2) an Aggregate of the melt removed instantaneously. The equations used for these melting models are derived in White (2013, Section 7.6.2) and appear on the diagrams. Notice that for small values of D_{i} and F, some of the C_{i}/C_{o} values will be so large that they are outside the range of the C_{i}/C_{o} axis. Note also that the symbols for C_{i}^{L} and C_{i}^{Total} in equation (4) of the text have been replaced by C_{i} and C_{o} here to simplify the expressions.