English to Russian Tech/Engineering Engineering: Industrial

For testing the depth of decarburisation, the amount of testing is, unless otherwise agreed, left to the manufacturer. The test is carried out by using the micrographic method specified in EURONORM 104 and under the following conditions.
— For round products, the measurement starts at the deepest uniformly decarburised zone, then three further measurements are made at right angles. The average of these four measurements is then taken.
— For flat products, the measurement is carried out on the inner third of the product and is started at the deepest uniformly decarburised zone, followed by a measurement on the opposite side. The average of these two measurements is then taken.
— Surface discontinuities are excluded from decarburisation measurements.

Не пойму смысла последнего предложения: что тут подразумевается под excluded from?
Речь идет о стальном прокате.