text: import numpy as np
  import matplotlib.pyplot as plt
  
  num_periods = 10
  amp = 10.
  T2 = 10
  
  x = np.linspace(np.pi/2., num_periods * 2. * np.pi, num_periods * 100)
  y = amp * np.sin(x) * np.exp(-x/T2)
  
  fig=plt.figure(figsize=[5, 5])
  ax = fig.add_axes([.1, .1, .8, .8])
  ax.plot(x, y)
  plt.axis('off')
  # ax.get_xaxis().set_visible(False)
  # ax.get_yaxis().set_visible(False)
  fig.savefig("FID_exp_decay.svg", bbox_inches='tight')
  plt.show()
  