code: func (r Hardware_Server) GetBandwidthImage(networkType *string, snapshotRange *string, draw *bool, dateSpecified *datatypes.Time, dateSpecifiedEnd *datatypes.Time) (resp datatypes.Container_Bandwidth_GraphOutputs, err error) {
  	params := []interface{}{
  		networkType,
  		snapshotRange,
  		draw,
  		dateSpecified,
  		dateSpecifiedEnd,
  	}
  	err = r.Session.DoRequest("SoftLayer_Hardware_Server", "getBandwidthImage", params, &r.Options, &resp)
  	return
  }
docs: // Use this method when needing a bandwidth image for a single server.  It will gather the correct input parameters for the generic graphing utility automatically based on the snapshot specified.  Use the $draw flag to suppress the generation of the actual binary PNG image.