| http://www.w3.org/ns/prov#value | - Then, a ratio ??r can be derived from equation 7. a r = { ??? k = 32 48 ??? ??? D ( k / 4 ) } / { ??? k = 2 96 ??? ??? D ( k / 4 ) } Equation ??? ??? 7 On the right hand side of this equation, the numerator represents the sum of the relative power density values within the 8 to 12 Hz frequency range in which alpha rhythms occur, whilst the denominator is a sum of the relative power density values
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