A line graph with two data lines. The x axis is labeled 'Cai' and ranges from 0.0 to 1.0. The y axis is labeled 'D and t_int*D' and ranges from -5 to 10. The red line starts at 0.0, peaks around 0.25 at a value of approximately 12, and then declines to around 0.0 at 1.0. The blue line starts at -5 at 0.0, rises to 0 at 0.5, and then declines to -5 at 1.0. All values are approximated.