Let the network function be written as :

N(s) = P(s) / Q(s)

Above equation consist of factors of the general form where p_r and p_n are complex frequencies. Their difference is also a complex frequency which  can be written as:

Where M_nr is the magnitude of the phasor and Φ_nr is the phase angle of the same phasor

Thus

All Ms and phase angles can be calculated using the pole-zero plot on s-plane

Procedure for calculation of M and Φ

1. 1. Plot the pole-zero of the network function
   2. Measure the distance of M_1r, M_2r … of a given pole from each zero
   3. Measure the distance of M_ar, M_br … of a given pole from each other finite pole
   4. Measure the angle Φ_1r, Φ_2r … from each of the finite zero
   5. Measure the angle Φ_ar, Φ_br … from each of the finite pole
   6. Substitute and find the values of K_r