GDUs: {HEAD ~ Growing degree units} which are calculated by the Barger Method, where the heat units for a 24 h period are calculated as {TAIL ~ GDUs=−50} 
GDUs : { HEAD ~ Growing degree units } which are calculated by the Barger Method , where the heat units for a 24 h period are calculated as { TAIL ~ GDUs=−50 }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL