title: How to create a 3 column table with merge header in Latex
body: <p><a href="https://i.stack.imgur.com/onIPu.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/onIPu.png" alt="Model Table"></a></p>
  
  <p>This is an example of the table I wish to do in Latex. This table is part of a set that should look like this:</p>
  
  <p><a href="https://i.stack.imgur.com/F4pyw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/F4pyw.png" alt="Complete set of tables"></a></p>
  
  <p>I have tried to use the usual table and other variations, but usually the tables end up overlapping and occupying the whole page.</p>
  
  <p>What will an example code to achieve it?</p>