title: duplicate columns header in data frame in R
body: <p>I have 4 duplicate column names in my dataframe. When I read the file, R automatically appends .1 or .2 to my duplicate columns
  Original table - </p>
  
  <pre><code>Date       Temp Press Probability Press Probability
  11/4/2015   100   45      0.65      55     0.85
  </code></pre>
  
  <p>What R is currently doing - </p>
  
  <pre><code>Date       Temp  Press   Probability  Press.1  Probability.1
  11/4/2015   100   45      0.65           55     0.85
  </code></pre>
  
  <p>I don't want R to add .1 to my duplicate columns. Is there a way I can avoid that and keep my parameter name as-is?
  Please advise
  Thanks</p>