In some cases impurities can make the interpretation of the results difficult due to uncertainty inpeak assignments. For mixtures which result in an unresolved band, upper and lower limits of log Pow, andthe area % of each log Pow peak should be reported. For mixtures which are a group of homologues, theweighted average log Pow should also be stated (7), calculated based on the single Pow values and thecorresponding area % values (8). All peaks that contribute an area of 5% or more to the total peak areashould be taken into consideration in the calculation (9):