  We propose a simplified procedure for the experimental application of the
efficiency correction on higher order cumulants in heavy-ion collisions. By
using the track-by-track efficiency, we can eliminate possible bias arising
from the average efficiencies calculated within the arbitrary binning of the
phase space. Furthermore, the corrected particle spectra is no longer necessary
for the average efficiency estimation and the time cost for the calculation of
bootstrap statistical error can be significantly reduced.
