title: Create a table in R with header expanding on two columns using xtable or any package
body: <p>I want to combine the tables from two dataframes and want to export that table to latex. The table that i want to create looks as follows. Note, the table below is created using excel. </p>
  
  <p><img src="https://i.stack.imgur.com/EXFoW.png" alt="enter image description here"></p>
  
  <p>From xtable in R I was able to export the table for two individual stations. get the following for two stations T1 and T2. How can I combine the output of two stations to get the desired output as above? </p>
  
  <p>Station T1:</p>
  
  <pre><code>&gt; stT1
          Observed-modeled |observed-modeled|
  Min.          -1.5360000          0.0001891
  1st Qu.        0.0002512          0.1633000
  Median         0.3593000          0.5390000
  Mean           0.8554000          1.0020000
  3rd Qu.        1.6470000          1.6470000
  Max.           5.5370000          5.5370000
  
  &gt; dput(stT1)
  structure(list(`Observed-modeled` = c(-1.536, 0.0002512, 0.3593, 
  0.8554, 1.647, 5.537), `|observed-modeled|` = c(0.0001891, 0.1633, 
  0.539, 1.002, 1.647, 5.537)), .Names = c("Observed-modeled", 
  "|observed-modeled|"), row.names = c("Min.", "1st Qu.", "Median", 
  "Mean", "3rd Qu.", "Max."), class = "data.frame")
  </code></pre>
  
  <p>Station T2:</p>
  
  <pre><code>&gt; stT2
          Observed-modeled |observed-modeled|
  Min.             -2.3740           0.001259
  1st Qu.          -1.2280           0.674700
  Median           -0.6202           1.101000
  Mean             -0.2094           1.085000
  3rd Qu.           0.7418           1.413000
  Max.              5.0530           5.053000
  
  &gt; dput(stT2)
  structure(list(`Observed-modeled` = c(-2.374, -1.228, -0.6202, 
  -0.2094, 0.7418, 5.053), `|observed-modeled|` = c(0.001259, 0.6747, 
  1.101, 1.085, 1.413, 5.053)), .Names = c("Observed-modeled", 
  "|observed-modeled|"), row.names = c("Min.", "1st Qu.", "Median", 
  "Mean", "3rd Qu.", "Max."), class = "data.frame")
  </code></pre>
  
  <p>I combined two stations as follows:</p>
  
  <pre><code>newstT &lt;- cbind(stT1,stT2)
  
  &gt; newstT
          Observed-modeled |observed-modeled| Observed-modeled |observed-modeled|
  Min.          -1.5360000          0.0001891          -2.3740           0.001259
  1st Qu.        0.0002512          0.1633000          -1.2280           0.674700
  Median         0.3593000          0.5390000          -0.6202           1.101000
  Mean           0.8554000          1.0020000          -0.2094           1.085000
  3rd Qu.        1.6470000          1.6470000           0.7418           1.413000
  Max.           5.5370000          5.5370000           5.0530           5.053000
  </code></pre>
  
  <p><strong>I was not able to add station T1 and station T2 at the top as shown in the desired figure.</strong> </p>