title: get specific lags from plot_acf that are over the confidence interval
body: <p>How do I get from this plot</p>
  <pre><code>import pandas as pd
  import matplotlib.pyplot as plt
  import statsmodels.api as sm
  
  dta = sm.datasets.sunspots.load_pandas().data
  dta.index = pd.Index(sm.tsa.datetools.dates_from_range('1700', '2008'))
  del dta[&quot;YEAR&quot;]
  sm.graphics.tsa.plot_acf(dta.values.squeeze(), lags=40)
  plt.show()
  </code></pre>
  <p>the specific lags that are over/under the confidence interval?</p>