| http://www.w3.org/ns/prov#value | - The parameters 420, 422 may, as appropriate, be any single system parameter of the phacoemulsification system or a combination of the system parameters (e.g., one or more of a vacuum level, a supply irrigation pressure, a supply irrigation flow rate, an aspiration pressure or rate, or a phaco parameter such as the power applied to the handpiece).
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