simulated impedance spectrum for testing calculation of DRT

The main data file (DAT) is a simulated Impedance dataset Z(f), created with ngspice. The data correspond to an electrical circuit consisting of 3 R-C elements and 3 R-CPE elements in series, The circuit and parameters of the elements are defined in the file .CIR; They correspond to those used by Schichlein et al in Journal of Applied Electrochemistry 32: 875–882, 2002 (see fig 3) and Boucamp Elec Acta 2018; with the purpose of testing different methods for calculating DRTs (distributions of relaxation times)主数据文件（DAT格式）为基于ngspice生成的模拟阻抗数据集Z(f)。该数据集对应一款由3个R-C元件与3个R-CPE元件串联构成的电路，该电路及其元件参数均在.CIR文件中定义；其电路与参数与Schichlein等人2002年发表于《应用电化学（Journal of Applied Electrochemistry）》第32卷第875–882页（参见图3）以及Boucamp于2018年发表在《电化学学报（Electrochimica Acta）》中的研究所用的内容一致，本数据集旨在用于测试各类弛豫时间分布（distributions of relaxation times, DRT）的计算方法。