DTW Barycentre Averaging (DBA). (A) Similar to Figure 6B. This time the signals are initial average signal u(k) and new signal x(i), whereas x(i) will be aligned and averaged with u(k). (B) DBA performs DTW to align both signals. The warping path indicates which datapoints from x(i) are aligned with what datapoints from u(k). There is a container for each k; we copy the datapoints that are warped to a specific k (see Figure 7A) into the corresponding container. (C) We compute from the datapoints of each container the average signal and SD. To build the average signal and SD of a group of signals, warp all signals with the initial average signal. This process fills the various containers with many more datapoints, however, the technique remains the same.