>> difff(fft(in/ 2^8), out/2^4)
max(data0-data1) =  +0.000000 +0.000000i =  +0 +0i
min(data0-data1) =  +0.000000 +0.000000i =  +0 +0i
max(data0/data1) = -Inf -Infi
min(data0/data1) = +Inf +Infi
approx separated mean(data0/data1) = +1.000000+ +0.000000i
Energy_data0 = 261888.062500
Energy_diff  = 0.000000