(7.4e) could reasonably be expected to be a Maxwell-Boltzmann with an exponential-exponential, or a power law tail, as per Reed and Hughes or Baek, Bernhardsson and Minnhagen or others [Reed & Hughes 2002, Baek et al 2011]. 208 EFTA00625336 An alternative approach is to look at equation (7.4e) from a max