The following metadata attributes are available to all GraphTool graphs:

• title - Title at the top of the graph.  To have a subtitle, have two lines of text (that is, anything after '\n' will be on the subtitle).
  
• title_size - Font size for the title
  
• xlabel - The label for the x-axis
  
• ylabel - The label for the y-axis
  
• columns - The number of columns present in the graph legend
  
• width - The width (in pixels) of the graph
  
• height - The height (in pixels) of the graph
  
• max_rows - The maximum number of rows in the graph legend
• legend - Set to False to remove the legend
  
• text_padding - The amount of padding between rows (in pixels) for the legend
  
• legend_padding - The amount of space between the axis and the legend; in the percent of the graph divided by 100
  
• watermark - A file containing the watermark (or set to False for no watermark)
  
• font_family - Font family for the graph's text
  
• font - Font name for the graph's text
  
• text_size - Size of the graph's text
  
• log_xaxis - Set to true to make the x-axis logarithm-based
  
• log_yaxis - Set to true to make the y-axis logarithm-based
  
• subtitle_size - size of the graph's subtitle, if present