How many yards difference was there between Gould's longest field goal kick and Graham's?
return Gould ;return Graham ;return field goal kicks of #1 ;return field goal kicks of #2 ;return yards of #3 ;return yards of #4 ;return the  longest of #5 ;return the  longest of #6 ;return the  difference of #7 and  #8
['select', 'select', 'project', 'project', 'project', 'project', 'aggregate', 'aggregate', 'arithmetic']