code: func (r Metric_Tracking_Object) GetBandwidthGraph(startDateTime *datatypes.Time, endDateTime *datatypes.Time, graphType *string, fontSize *int, graphWidth *int, graphHeight *int, doNotShowTimeZone *bool) (resp datatypes.Container_Bandwidth_GraphOutputs, err error) {
  	params := []interface{}{
  		startDateTime,
  		endDateTime,
  		graphType,
  		fontSize,
  		graphWidth,
  		graphHeight,
  		doNotShowTimeZone,
  	}
  	err = r.Session.DoRequest("SoftLayer_Metric_Tracking_Object", "getBandwidthGraph", params, &r.Options, &resp)
  	return
  }
docs: // Retrieve a PNG image of a bandwidth graph representing the bandwidth usage over time recorded by SofTLayer's bandwidth pollers.