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