Ext Dimensions for simple modules of block 1 for U3(4) in characteristic 13

First column gives names of simples in the Basic algebra.
φi refers to the corresponding simple in the Atlas of Brauer Characters.

φ5 φ1 φ6
1 φ5 0 0 1
2 φ1 0 0 1
3 φ6 1 1 0