d1pv7a_    d1pv7b_    d1pv6a_    d1pv6b_ 
d1pv7a_           0.0        0.0        0.0        0.0 
d1pv7b_           0.0        0.0        0.0        0.0 
d1pv6a_           0.0        0.0        0.0        0.0 
d1pv6b_           0.0        0.0        0.0        0.0