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Definition: Tailing factor. The tailing factor is a measure of peak tailing. It is defined as the distance from the front slope of the peak to the back slope divided by twice the distance from the center line of the peak to the front slope, with all measurements made at 5% of the maximum peak height.t is defined as the distance from the front slope of the peak to the back slope divided by twice the distance from the center line of the peak to the front slope, with all measurements made at 5% of the maximum peak height.
Two of the analytical issues as a result of peak tailing are: 1  Peaks with a large A s value might have a significantly reduced peak height. 2  Data analysis systems might not accurately assign the end of a peak, so the peak area is mis-calculated.onsequently, if tailing is quantified, it is possible to place an acceptable limit on the amount a peak can tail. There are two main methods for defining peak tailing: 1  Tailing factor (Tf) â widely used in the pharmaceutical industry.