d1y0ga_    d1y0gb_    d1y0gc_    d1y0gd_ 
d1y0ga_           0.0        0.0        0.0        0.0 
d1y0gb_           0.0        0.0        0.0        0.0 
d1y0gc_           0.0        0.0        0.0        0.0 
d1y0gd_           0.0        0.0        0.0        0.0