| http://www.w3.org/ns/prov#value | - In addition, a method shown in FIG. 11 of setting the reference value 2 equal to the double (or n times) of the reference value 1 and acquiring threshold current by subtracting difference data (or difference data l/n) between the data 1 when the reference value 1 is exceeded and the data 2 when the reference value 2 is exceeded from the data 1 is also proposed and as operation such as division is
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