For each sampled and held analog input signal Sa, {HEAD ~ the set} of references used to vary voltages for writing is {TAIL ~ Sa} ±1/2 LSB, where LSB is the difference between two adjacent states 
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For each sampled and held analog input signal Sa , { HEAD ~ the set } of references used to vary voltages for writing is { TAIL ~ Sa } ±1/2 LSB , where LSB is the difference between two adjacent states
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH