If the results from three or more out of the five test specimens have to be rejected, the method is unsuitable.If agreed, test additional test specimens, preferably doubling the number of test specimens. In such cases, the reporting of the results shall also be agreed.Annex D describes a method using enlarged test specimens (8.2.2) which may be acceptable to samples considered untearable by the test using small-width test specimens or for special tear-resistant fabrics.NOTE: If both methods are not satisfactory other methods of test such as the double tongue tear or wing tear may be considered (see annex E).10Calculation and expression of resultsTwo methods of calculation are specified, manual and electronic. They may not lead to the same result and results calculated by different methods are not to be compared.10.1 Evaluation of tear forces from the chart recordingFor a sample of calculation, see annex C.10.1.1 Divide the peak trace, beginning with the first peak and ending with the last peak, into four equal parts (see annex C). The first part shall not be used for the calculation of the mean value. From each of the three remaining subsections, select and note the two highest and the two lowest peaks. A peak suitable for calculation is characterized by a 10%min. rising and fallilng of force (see 3.4).10.1.2 For each test specimen, calculate the arithmetic mean in newtons of the 12 peak values obtained according to 10.1 .1.NOTE: For manual evaluations a limited number of selected peaks is chosen to keep calculation time acceptable. For calculation including all peaks, electronic evaluation is recommended.10.1.3 From the mean calculated for each test specimen (see 10.1.2), calculate the overall arithmetic mean of the tear force in newtons for each fabric direction tested, and round it to two significant figures.10.1.4 If required, calculate the coefficient of variation to the nearest 0,1%and the 95% confidence limits in newtons rounded to two significant figures, using the mean test specimen values as calculated according to 10.1.2.10.1.5 If required, calculate the mean of the six highest peak values for each test specimen in newtons.10.1.6 If required, note the highest and the lowest peak value (maximum peak distance) for each test specimen, in newtons.10.2 Calculation using electronic devicesFor a sample of calculation, see annex C.10.2.1 Divide the tearing length between the first and last peak recorded into four equal parts (see annex C). Ignoring the first part of the tearing length, all peaks of the remaining distance are recorded. A peak suitable for calculation is characterized by a 10%min. rising and falling of force (see 3.4).