Figure 25

Figure 25: Confidence region at 68% for three different values of zmax = 2.5,3.5, 4, red solid, green long-dashed and blue dashed contour, respectively. The left panel shows the confidence region when the sound speed is 2 cs = 1; the right panel with the sound speed 2 − 6 cs = 10. The equation of state parameter is for both cases w0 = − 0.8.