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Red: Maximum safe value found (if any) is below the optimal fill fraction value determined for the linear regime . That value is provided (given in parentheses). In this caseother words, thermal considerations are the limiting factor at this speed/amplitude.
Orange: Value represents the optimal fill fraction value determined for the linear regime. At that value, stable temperature was reached in the range of 40-50°C at 1 hr. Higher fill fractions in the nonlinear regime were not tested and appear to be at risk of overheating.
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