Original: The third assessment report ( TAR ) prominently featured a graph labeled '' Millennial Northern Hemisphere temperature reconstruction '' from a 1999 paper by Michael E. Mann , Raymond S. Bradley and Malcolm K. Hughes ( MBH99 ) often referred to as the '' Hockey Stick Graph '' .
Simplified: The IPCC Third Assessment Report showed a graph labeled '' Millennial Northern Hemisphere temperature reconstruction '' from a paper by Mann , Bradley and Hughes ( MBH98 ) often called the '' Hockey Stick Graph '' .