FIGURE 3. (top) Results of site occupancy studies of orthopyroxenes equilibrated at 900–1000 °C, including those from this study. The dashed horizontal lines represent the equation formulated by Wang et al. (2005) to relate lnK_D to Fs content at these temperatures. The line does not adequately represent the Fe partitioning in samples with higher Fe contents. (bottom) K_D values from the current study using M1 and M2 occupancies calculated from a range of C values based on different, arbitrarily selected ratios of recoil-free fraction for the two sites. No choice of value for C will result in a horizontal line of equal K_D values.