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     #     GUI   Heat of formation (Kcal/formula unit) Geometry        Species
                    Ref.        PM7     PM6-D3H4      PM7 PM6-D3H4 
  2010  (JSmol)              -1220.9      -1443.2           29.0       26.6   Yb Complex Sparkle (BUVYEW01) 
  2011  (JSmol)                  237.3        -103.8           21.9       18.0   Yb Complex Sparkle (MIPTUA) 
  2012  (JSmol)                  371.5          -65.5           16.6       13.9   Yb Complex Sparkle (QAXYAP) 
  2013  (JSmol)                  222.2        -148.8           21.8       19.4   Yb Complex Sparkle (RENXIR) 
  2014  (JSmol)                  348.7            75.0           20.7       27.3   Yb Complex Sparkle (YIZHUK) 
  2015  (JSmol)                  349.0            75.0           20.8       27.3   Yb ComplexSparkle (YIZHUK) 
  2016  (JSmol)              -1725.3      -2155.9           20.9       24.0   Yb Complex Sparkle (QAKXIJ)