(A) The MUP firing raster showed the extrapotential time-locked to the main MUP component with an isoelectric interval ofabout 13 ms, which suggested a satellite potential.

(B) The duration measuredautomatically.

(C) Manual adjustment to include the satellite potential.

Figure 1: An MUP with a satellite potential sample obtained from a 48-year-old woman withthe experience of vaginal delivery.