Tailing factor (USA)

The tailing factor TUSP is used in the USA according to the guidelines of the US Pharmacopeia.  Peak symmetry is measured at 5% of the peak height:

Tusp = (f5% + t5%) / 2 f5%

(f5% = the peak width of the front at 5% of the peak height; t5% = the peak width of the tail at 5% of the peak height) 

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