  Multi-peaked analytically extended function (AEF), previously applied by the
authors to modelling of lightning discharge currents, is used in this paper for
representation of the electrostatic discharge (ESD) currents. The fitting to
data is achieved by interpolation of certain data points. In order to minimize
unstable behaviour, the exponents of the AEF are chosen from a certain
arithmetic sequence and the interpolated points are chosen according to a
D-optimal design. ESD currents' modelling is illustrated through two examples:
one corresponding to an approximation of the IEC Standard 61000-4-2 waveshape,
and the other to representation of some measured ESD current.
