new_contents: import sys
  import pandas as pd
  import matplotlib
  import matplotlib.pyplot as plt
  
  matplotlib.style.use('ggplot')
  
  with open(sys.argv[1]) as f:
      table = pd.read_table(f, sep=" ", header=None,
          names=("start", "latency"))
  
  # use zero start time in seconds
  table['start'] = table['start'] - min(table['start'])
  table['start'] = table['start'] / (10.0**9)
  
  # convert from ns to ms
  table['latency'] = table['latency'] / (10.0**6)
  
  ax = table.plot(x='start', y='latency')
  ax.set_xlabel("time (sec)")
  ax.set_ylabel("latency (ms)")
  
  plt.show()
  
subject: add script to plot latency