The threshold limits are relative values used to represent {HEAD ~ the standard deviation} of {TAIL ~ the sensor data} 
of
The threshold limits are relative values used to represent { HEAD ~ the standard deviation } of { TAIL ~ the sensor data }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL