title: Removing all grid lines in Google Charts API
body: <p>I am using the Google Charts API to create a stepped area chart and I'd like to remove all horizontal lines in my chart. I've looked at all the documentation for the options, but I don't see any way to remove it. Is there some way to trick the API into removing them or am I stuck with them? The lines I am talking about is in the picture below, just to clear possible confusion.</p>
  
  <p><a href="https://i.stack.imgur.com/PtNdt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PtNdt.png" alt="enter image description here"></a></p>