английский => русский Техника Авиация и космонавтика, летательные аппараты Coiled Tubing Recommended Practice

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Помогите, пожалуйста, понять выражение "a function of the amount of ovality" в следующем контексте:

This is a technique that is used to reduce ovality and improve fatigue life of the tubing by pressurizing the tubing until the
stress at the inner wall of the tubing is in the plastic range. By applying internal pressure in this manner ovality is reduced
by forcing the tube to assume a shape closer to the original diameter. Also, after the removal of the pressure, the inner
wall has a residual compressive stress that reduces the effect of minor imperfections and irregularities in the inner tube
wall. Tests by major airframe manufacturers demonstrated increased fatigue impulse life after autofrettage of tubing.
These benefits are a function of the amount of ovality with little advantage when ovality is less than or equal to 2%.

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