(Color online) Experimental data from a paddlefish electroreceptor (PER) afferents. (a): Fano factors for the original (solid line) and renewal (dotted line) spike trains, and (b): SCCs for an afferent with mean ISI 〈I〉 = 15.8 ms, CV = 0.163, and fe/fa = 0.43. (c): The ratio of discriminability slopes, R(T), for three different afferents. Arrow: afferent shown in panels (a),(b). (d),(e): R at 1 s window vs. CV and vs. fe/fa for a population of 56 PER afferents.