title: How to show shaded error bands when the data is in two different dataframes?
body: <p>I want to plot a line graph with shaded error bands across this line. My data is in two different data frames. First dataframe, as shown below, has mean and the positive error is mean + stdev, negative error is mean - stdev. A different dataframe has x-axis  as the column against which I want to plot mean and error bands.</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>​a</th>
  <th>b</th>
  <th>mean</th>
  <th>stdev</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>0.05</td>
  <td>0.06</td>
  <td>0.055</td>
  <td>0.007</td>
  </tr>
  <tr>
  <td>0.1</td>
  <td>0.13</td>
  <td>0.115</td>
  <td>0.02</td>
  </tr>
  <tr>
  <td>-0.2</td>
  <td>-0.5</td>
  <td>-0.35</td>
  <td>0.21</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>I found few discussions on how to do this with lists and arrays but nothing with dataframes.
  <a href="https://stackoverflow.com/questions/61368805/how-to-plot-shaded-error-bands-with-seaborn">How to plot shaded error bands with seaborn?</a></p>