title: What does 'gridSize' define in MarkerClusterer under 'option' object?
body: <p>I am working on Google Maps and clustering of markers using MarkerClusterer library. What exactly does 'gridSize' parameter define in 'option' object? If it is the size of a cluster image in pixels, then how can I change it for different clusters in the same map?</p>
  
  <p>I have tried using the MarkerClusterer library using the documentation provided at this link: <a href="https://developers.google.com/maps/documentation/javascript/marker-clustering" rel="nofollow noreferrer">https://developers.google.com/maps/documentation/javascript/marker-clustering</a></p>
  
  <p>It doesn't explain how to change and add 'option' object and how can we edit the option code according to our needs.</p>
  
  <p>I would like you to help me with making the cluster image size different for different clusters on the same map.</p>