title: Creating graph with x-axis only using D3
body: <p>I want to look for tutorials for creating a graph like the one below, but i don't seem to know the name of such a graph. <img src="https://i.stack.imgur.com/r90D6.jpg" alt="Image example"></p>
  
  <p>Can any one tell me the name of such a graph, or point me to tutorials i can check out.</p>