code: func (r Virtual_Guest) GetMemoryMetricImage(snapshotRange *string, dateSpecified *datatypes.Time) (resp datatypes.Container_Bandwidth_GraphOutputs, err error) {
  	params := []interface{}{
  		snapshotRange,
  		dateSpecified,
  	}
  	err = r.Session.DoRequest("SoftLayer_Virtual_Guest", "getMemoryMetricImage", params, &r.Options, &resp)
  	return
  }
docs: // Use this method when needing a memory usage image for a single guest.  It will gather the correct input parameters for the generic graphing utility automatically based on the snapshot specified.