Given the unity feedback system of Figure P8.3, make an accurate plot

Given the unity feedback system of Figure P8.3, make an accurate plot of the root locus for the following:

a.

b.

Also, do the following:

Calibrate the gain for at least four points for each case. Also find the breakaway points, the jω-axis crossing, and the range of gain for stability for each case. Find the angles of arrival for Part a.