d4tf4a1    d4tf4b1    d3tf4a1    d3tf4b1 
d4tf4a1           0.0        0.0        0.0        0.0 
d4tf4b1           0.0        0.0        0.0        0.0 
d3tf4a1           0.0        0.0        0.0        0.0 
d3tf4b1           0.0        0.0        0.0        0.0