d1ffvb1    d1ffve1    d1ffub1    d1ffue1 
d1ffvb1           0.0        0.0        0.0        0.0 
d1ffve1           0.0        0.0        0.0        0.0 
d1ffub1           0.0        0.0        0.0        0.0 
d1ffue1           0.0        0.0        0.0        0.0