  In this paper, as an improvement of the paper [K. Ishige, T. Kawakami and H.
Michihisa, SIAM J. Math. Anal. 49 (2017) pp. 2167--2190], we obtain the higher
order asymptotic expansions of the large time behavior of the solution to the
Cauchy problem for inhomogeneous fractional diffusion equations and nonlinear
fractional diffusion equations.
