Distribution of spectral indices and S/N for 45 pulses above 10σ threshold. The top histogram is the distribution of S/N and the dotted green line is a power law fit, with the legends highlighting the parameters. The vertical histogram on the left is the histogram of spectral indices. The dotted red line represents the best-fitting Gaussian curve to the distribution. The mean spectral index was obtained as α = −0.5 ± 1.3.