title: pandas scatter plot not showing all data
body: <p>I am new to pandas data visulaizations and I'm having some trouble with a simple scatter plot. I have a dataframe loaded up from a csv, 6 columns, and 137 rows. But when I try to scatter the data from two columns, I only see 20 datapoints in the generated graph. I expected to see all 137. Any suggestions?</p>
  
  <p>Here is a tidbit of code:</p>
  
  <pre><code>import pandas as pd
  import matplotlib.pyplot as plt
  plt.style.use('ggplot')
  df = pd.read_csv(file, sep=',', header=0)
  df.plot.scatter(x="Parte_aerea_peso_fresco", y="APCEi", marker=".")
  </code></pre>
  
  <p>And here is the output.
  <a href="https://i.stack.imgur.com/CtP6T.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CtP6T.png" alt="enter image description here"></a></p>