MatClassMultCoeffsCharTable( tbl, class )
returns the matrix <C_i> = [ a_{ijk}]_{j,k} of structure constants (see ClassMultCoeffCharTable).
gap> L3_2:= CharTable( "L3(2)" );; gap> MatClassMultCoeffsCharTable( t, 2 ); [ [ 0, 1, 0, 0, 0, 0 ], [ 21, 4, 3, 4, 0, 0 ], [ 0, 8, 6, 8, 7, 7 ], [ 0, 8, 6, 1, 7, 7 ], [ 0, 0, 3, 4, 0, 7 ], [ 0, 0, 3, 4, 7, 0 ] ]
GAP 3.4.4