  The primordial curvature fluctuation spectrum is reconstructed by the maximum
likelihood reconstruction method using the five-year Wilkinson Microwave
Anisotropy Probe data of the cosmic microwave background temperature
anisotropy. We apply the covariance matrix analysis and decompose the
reconstructed spectrum into statistically independent band-powers. The
prominent peak off a simple power-law spectrum found in our previous analysis
turn out to be a $3.3\sigma$ deviation. From the statistics of primordial
spectra reconstructed from mock observations, the probability that a primordial
spectrum including such excess is realized in a power-law model is estimated to
be about 2%.
