Now figure and ax are sub-classes of matplotlib original functions. And often they return themself
fig, ax = ap.subplots(1, 1)
freqs__Hz = np.linspace(0, 10, 100)
signal__GHz = np.sin(freqs__Hz)
ax.plot(freqs__Hz, signal__GHz, label="line 1", linestyle="--").autoaxis()
