| http://www.w3.org/ns/prov#value | - Note that as given in Tables 4 to 24, it has been found that when a material including M is used for the recording layer, and the ratio of M is excessive, the C/N value for 8 T is sometimes less than 45 dB, and if the ratio of the total number of the Bi and O atoms to the total number of the Bi, O, and M atoms is 80% or higher, a C/N value for 8 T of 45 dB or more can surely be obtained.
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