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To investigate source eccentricity (azimuthal position), we restricted the sounds to be audible only in the predefined shaded regions shown. Each of these spanned 40° about a mean azimuth of 0°, 45°, or 90° with respect to body centered straight ahead. Because our arc of speakers did not completely surround the listener, she or he was positioned facing the speaker at 45° as shown to achieve the desired eccentricities.
