Airspeedmeter algorithm

My Airspeed meter has a lot of offset drift, mostly temperature drift.Does someone knows the algorithm used in the APM - MP to display the airspeed ?I'm looking for something like this:Reading_airspeed [m/s] = FACTOR * ARSPD_RATIO * ( RAW_ADC_Measurement - ARSPD_OFFSET)'73 Maarten

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