d1w0ia1    d1w0ia2    d1w0ib1    d1w0ib2 
d1w0ia1           0.0     1910.5        0.0     1910.3 
d1w0ia2        1910.5        0.0     1909.9       14.0 
d1w0ib1           0.0     1909.9        0.0     1909.7 
d1w0ib2        1910.3       14.0     1909.7        0.0