code: def lineWidth(requestContext, seriesList, width):
      
      for series in seriesList:
          series.options['lineWidth'] = width
      return seriesList
docs: Takes one metric or a wildcard seriesList, followed by a float F.
  
      Draw the selected metrics with a line width of F, overriding the default
      value of 1, or the &lineWidth=X.X parameter.
  
      Useful for highlighting a single metric out of many, or having multiple
      line widths in one graph.
  
      Example::
  
          &target=lineWidth(server01.instance01.memory.free,5)