Summary of data sets obtained from different donor organizations: (DH)–“Deutschland hilft” (Germany), (AH)–“Andheri-Hilfe” (Germany), (GK)–“Glückskette” (Switzerland).

Each data set contains the amount of each individual donation together with the date of donation. gives the total amount of donations (local currency) in the given time interval (top: before, bottom: after the tsunami), the total number of donations, respectively. α is the exponent of the power law, Eq. (1) together with the standard error σ. μ and τ are the fit parameters of Eqs. (2), (3) together with their standard errors. The two different values of μ and τ are obtained from the two different time series for the the number (°) and the amount (*) of donations.