Examples of OGCF(s, o) computed at the point that maximizes GCF with N
= 7 and N
= 128. The figure refers to a case where the source is in a central position of the room in Figure 7 and oriented approximately toward -π/2. The inner curves are obtained using only microphone pairs 1-2 and 5-6, respectively, (see Figure 1). The external curve corresponds to the use of 7 microphone pairs. Arrows indicate the directions corresponding to the maximum values of each OGCF function. The scale for OGCF values is logarithmic.