where l˜r is the normalized lead-field vector defined as l˜r=lr/lr. An optimal orientation dopt(r) was determined by computing the solution that maximizes output SNR with respect to d [45, 47]. The estimated source power P˜sr can be computed from the weights w(r) and the covariance R:Pˆsr=s˜r,t2=wTrRwr.
