Different climate states as a function of time and planetary distance a. The colors have the same meanings as in Figure 9. The four panels show differences in the intrinsic degree of land weathering and seafloor weathering, with the same total amount. Panels (a)–(d) have W_L0 = 1/3, 1/4, 1/6, and 1/12, respectively. In all cases, W_L0 + W_S0 = 1/3. The values of the β and θ parameters are the same as in Figure 9.