Example of the FastDTW applications. (a) The FastDTW alignments (cyan) between the OMNI (black) and Helio1D (magenta) sequences for the solar wind speed, from 27 December 2005 to 14 February 2006. Histograms of (b) time difference (Δt) and (c) velocity difference (ΔV) obtained from the FastDTW alignments from January 2005 to June 2013 with the corresponding statistics (see text). The Gaussian (b) and the Cauchy-Lorentzian (c) distribution fits (red solid lines) are added for comparisons with the best-fit parameters in red applied for the Δt and ΔV distributions, respectively.