Changes in the RXTE/PCA spectral shape of V4641 Sgr during the outburst periods of 1999, 2002, 2003, and 2005. All the spectra have been normalized to the 7 keV flux in the first spectrum to show the difference in spectral shape. Top panel: outburst spectra reminiscent of the spectra with high count rate and low absorption of V404 Cyg (Walton et al. 2017), bottom panel: spectra reminiscent of the flaring spectra with lower count rate and higher absorption of V404 Cyg in Fig. 5.