When doing a graph and there both positive and negative values on the graph and the axis cross at zero, the x axis labels automatically run along the middle of the graph. I want to move the labels down out of the middle of the graph but not change where the axis crosses. Is there a way to keep the axis crossing at zero but move the labels down below the plot area? For example, if the values correspond with the months of the year, I want the month labels along the bottom of the plot area.