# Commission Regulation (EEC) No 2568/91 of 11 July 1991 on the characteristics of olive oil and olive-residue oil and on the relevant methods of analysis, Division 4.4.3: Calculation and expression of results

Extent: E+W+S+N.I.

Use the area normalisation method, i.e. assume that the sum of the areas of the peaks corresponding to TAGs from ECN 42 up to ECN 52 is equal to 100 %.
Calculate the relative percentage of each triglyceride using the formula:
% triglyceride = area of peak × 100 ∕ sum of peak areas .
The results should be given to at least two decimal places.
See notes 1 to 4.

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Source: https://www.legislation.gov.uk/eur/1991/2568/annex/XVIII/division/4/division/4.4/division/4.4.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-1991-2568/annex-XVIII/division-4/division-4.4/division-4.4.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.