Remove spacing between cells in tablelayoutpanel in Windows form?

I've programmatically created a class, Map, that inherits from the TableLayoutPanel class. The Map class adds Tile objects (children of Panel) that each have a background image. Everything works except that there is a noticeable space between each cell that I would like to remove.

I've looked around, but cannot figure out how to remove the space between the cells in the TableLayoutPanel. What's the easiest way to remove it?