| http://www.w3.org/ns/prov#value | - U1 and U2 are positive voltages of e.g. 10 V. Up is likewise a positive voltage which is defined by UG - US in row 3 of the table, and amounts to 30 V-40 V. If a sufficiently strong negative voltage occurs for UG - US, an item of information is erased in the corresponding cell.
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