def METHOD_NAME(waves, calcs, i_start=0, i_end=500):
    """ Simple mean, vectorized version of baseline calcsulator """
    wf_block = waves["waveform"]
    # find wf means
    avgs = np.mean(wf_block[:, i_start:i_end], axis=1)
    # add the result as a new column
    calcs["bl_avg"] = avgs
    return calcs