d1bxsa_    d1bxsb_    d1bxsc_    d1bxsd_ 
d1bxsa_           0.0        0.0        0.0        0.0 
d1bxsb_           0.0        0.0        0.0        0.0 
d1bxsc_           0.0        0.0        0.0        0.0 
d1bxsd_           0.0        0.0        0.0        0.0