The relations between Eye diagram and reflection coefficient

Plotting the eye diagram, The generator has Vhigh as 1V

For the first scenario. Zs=150 Ohm, Z0=75 Ohm, ZL=120 Ohm
The load reflection coefficient is 0.231
The source reflection coefficient is -0.1~-0.5 in real part

I get the below eye diagram for Vin (between Zs and Z0) and Vout (between Z0 and ZL)
For the Vin
the high is around 0.33 to 0.44V
the low is around 0 to 0.11V
For the Vout
the high is around 0.41 to 0.44V
the low is around 0 to 0.3V



For the second scenario. Zs=150 Ohm, Z0=75 Ohm, ZL=75 Ohm
The load reflection coefficient is 0
The source reflection coefficient is -0.33

I get the below diagram
both Vin and Vout has
The high 0.33V
The low 0V


Does someone know how these reflection coefficients translate into the eye diagram? whats their relations?