{{ size= <{$T2}> x <{$T3}> }} $T2 * $T3 ($T1*)data.data {{ size={data.nr_} x <{$T2}> }} data.nr_ * $T2 ($T1*)data.data {{ size= <{$T2}> x {data.nc_} }} $T2 * data.nc_ ($T1*)data.data {{ size= {data.nc_} x {data.nc_} }} data.nr_*data.nc_ ($T1*)data.data