text: ‚Ä¶as abnormal were then replaced by an interpolated signal using the Net Station software‚Äôs ‚ÄúBad Channel Replacement‚Äù (BCR) waveform tool, which uses spherical splines to approximate the signal from the remaining electrodes (Fletcher et al. 1996; Perrin et al. 1987; Srinivasan et al. 1996).