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1st vector, mtx-elements 0 -3 : (R) right vector of the coord-system
2nd vector, mtx-elements 4 -7 : (U) up-vector of the coord-system
3rd vector, mtx-elements 8 -11 : (D) (negated) direction vector of the coord-system
4rd point , mtx-elements 12-15 : (P) position(origin) of the coord-system
You can see it quite well in the identity matrix
R U D P
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
Hope it helps :)
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