In this particulair simulation a1 = 160 and a2 = 200. That means that the final value of 160 is reached after 200 billion years. This implies that in the range of 0 to 14 billion years
the function increases linear.
b1 = 0 that means no acceleration is involved.



The blue line Figure 2 shows the speed involved near the 100% line (the black line in Figure 1) is much larger than c.
The magenta line in Figure 2 shows the expansion speed of the blue line in Figure 1.
Back to Friedmann's Equation Question 4