Suzaku/XIS spectra (blue) and Swift/XRT (red) of Swift J1644+57 at the decay phase (both on 2011 April 6, MJD = 55 657) in normalized counts fitted using the phabs*zphabs*bmc^z model with α = 0.63 ± 0.01, log (A) = −0.72 ± 0.2, kT_s = 240 ± 5 eV for the Suzaku spectrum, Sz1 ( for 1566 d.o.f.) and with α = 0.77 ± 0.04, log (A) = −1.62 ± 0.09, kT_s = 200 ± 20 eV ( for 659 d.o.f.) for the Swift spectrum. The spectral models are shown by black hystograms.