import pandas as pd
import numpy as np
import matplotlib.pylab as plt

x=np.linspace(0,50,100)
ts1=pd.Series(3.1*np.sin(x/1.5)+3.5)
ts2=pd.Series(2.2*np.sin(x/3.5+2.4)+3.2)
ts3=pd.Series(0.04*x+3.0)

ts1.plot()
ts2.plot()
ts3.plot()

plt.ylim(-2,10)
plt.legend(['ts1','ts2','ts3'])
plt.show()