{TAIL ~ The method} 1, wherein the compensation voltage is determined by calculating {HEAD ~ a difference} between the value of the at least one parameter and a fixed stored value and determining the compensation voltage from a stored relationship of differences to compensation voltages 
{ TAIL ~ The method } 1 , wherein the compensation voltage is determined by calculating { HEAD ~ a difference } between the value of the at least one parameter and a fixed stored value and determining the compensation voltage from a stored relationship of differences to compensation voltages
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