(

**a**) Plot of the concatenated templates and their standard deviation. For the averaging all detected spikes from trial 50 to trial 90 were used. The vertical lines indicate the concatenation points, while the colored dots on the right serve as a label. On the left, the

value is shown, the channel length of the template being

*T*_{f} = 47 and

*N* = 4. The corresponding

are (10.06, 13.28, 21.82, 11.57, 13.12, 13.32, 14.27, 10.34), and the

are (1.84, 3.73, 4.22, 2.91, 2.90, 3.45, 2.99, 2.53), respectively. (

**b**) Histograms of the inter-spike interval distributions with a bin size of 1 ms. The numbers on the left represent the percentage of spikes with an inter-spike interval of less than 3 ms. (

**c**) Projection test of the found clusters. The fit (solid line) represents a Gaussian distribution whose mean is the corresponding template and with variance 1. The D value indicates the distance in standard deviations between the means. Note that in case of acute recordings, the waveforms change over time and thus the projection test is only meaningful for short time intervals; see also Fig. . For the projection test the same spikes as in (

**a**) were used

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