code: function(instance, helper, data){
  			
  			// this function is pretty dumb and does not check if there is actually
  			// enough space available around the tooltip to move it, it just makes it
  			// snap to the grid. You might want to do something smarter in your app!
  			
  			var gridBcr = $('#demo-position-grid')[0].getBoundingClientRect(),
  				arrowSize = parseInt($(helper.tooltipClone).find('.tooltipster-box').css('margin-left'));
  			
  			// override these
  			data.coord = {
  				// move the tooltip so the arrow overflows the grid
  				left: gridBcr.left - arrowSize,
  				top: gridBcr.top
  			};
  			
  			return data;
  		}
docs: 8 extra pixels for the arrow to overflow the grid