We consider the eigenvalues of sample covariance matrices form Q=(Σ1/2X)(Σ1/2X)∗. The X is an M×N rectangular random matrix with real independent entries and population Σ a positive definite diagonal X. Assuming that limiting spectral density exhibits convex decay at right edge spectrum, in limit M,N→∞ N/M→d∈(0,∞), we find certain threshold d+ such for d>d+ distribution Q also spectrum. In this...