Hi,
if you only need a visual hint and no software comparison, you can do something like below, else you will need to construct f_lim and db_lim from network.frequency.f.
from matplotlib import pyplot as plt
import numpy as np
rf.stylely()
f_lim = np.array([0, 4e9, 16e9, 48e9])
db_lim = np.array([-20, -20, -10, -10])
plt.figure()
# network is the network to plot
network.plot_s_db(0,0, label = 'example, SDD11')
plt.plot(f_lim, db_lim, linestyle = 'dashed', color = 'red', linewidth = 2, label = 'limit')
Best regards,
Matthias