An additional note. You might be tempted to say D1 = {1,0,0,0,0,0} and D2 = {0,0,1,0,0,0} thus D1+D2 = {1,0,1,0,0,0} but this would be incorrect.

I think CAESAR averages the 2? D1+D2 = {0.5, 0, 0.5, 0, 0, 0}.

(Or it could also do SRSS - I just don't remember.)