title: Pandas boxplot with ranges in x-axis
body: <p>I have the foll. dataframe in pandas:</p>
  
  <pre><code>value   combined_delta
  100 7
  100 45
  100 49
  100 12
  100 71
  94.09   21
  91.42   45
  88.7    36
  87.26   34
  77.61   55
  76.3    28
  73.81   89
  71  80
  69.5    27
  67.45   12
  66.96   127
  66.18   43
  54.48   68
  54.15   23
  53.29   48
  53.29   49
  53.25   302
  51.99   24
  51.99   116
  50.73   22
  49.7    101  
  31.05   107
  31  63
  30.19   116
  30.12   58
  29.38   31
  29.18   8
  29  104
  28.6    61
  28.6    63
  28.56   60
  28.11   35
  27.36   50
  27.32   63
  26.87   103
  26.87   257
  26.42   55
  26.35   85
  26.1    27
  25.79   21
  25.79   66
  25.66   77
  25.53   9
  25.46   92
  25.46   248
  24.67   15
  24.6    93
  24.39   5
  24.01   28
  24.01   82
  23.86   19
  23.18   133
  22.71   41
  22.62   37
  21.81   43
  21.52   34
  21.43   35
  21.23   40
  21.23   25
  20  75
  19.98   31
  19.98   44
  19.84   12
  19.82   62
  18.83   26
  18.71   202
  18.02   7
  18  28
  17.99   39
  17.75   40
  17.68   81
  17.67   16
  17.55   54
  17.25   13
  16.63   19
  12.14   22
  12.01   24
  12  59
  11.95   49
  11.54   39
  </code></pre>
  
  <p>How can I make a boxplot where the x-axis shows ranges for <code>value</code>: 0-20, 20-40, 40-60,60-80,80-100 and the y-axis shows <code>combined_delta</code> values?</p>
  
  <p>I can use seaborn like this:</p>
  
  <pre><code>ax = sns.boxplot(x="value", y="combined_delta", data=df)
  </code></pre>
  
  <p>However, this will not create the ranges from the x-axis the way I want</p>