Prominence argument: misspelled or intended?

[OedoSoldier]

In scripts/InitializationNotebook.ipynb:

try:
    trim_min = sorted(size)[round(len(size) ** 0.05)]
except:
    import code; code.interact(local=dict(globals(), **locals()))
trim_max = sorted(size)[round(len(size) ** 0.95)]
trim_range = trim_max - trim_min
peaks = set(scipy.signal.find_peaks(-size, distance=20, prominence=(0.50 * trim_range))[0])

I've noticed the indices of sorted size/area list are calculated by the length of the video, but I can't grasp why using exponent (len ** 0.05/0.95) instead of multiple (len * 0.05/0.95) to obtain a trimmed mean?