Time-resolved (2 s bins) properties, with 1σ errors, of the thermonuclear X-ray burst observed from IGR J17591–2342 with AstroSat/LAXPC (see Section 4.1). The upper panel shows reduced χ² profiles for the spectral fitting with the XSPEC models tbabs(bbodyrad+constant*powerlaw) (black; power-law parameter values frozen to the pre-burst values) and tbabs(bbodyrad+powerlaw) (red). This panel shows that the fitting is not acceptable. Overall, the fitting does not improve when the spectral shape (power-law photon index) is made free, and the reduced χ² profiles have two humps. The middle and lower panels show the blackbody (bbodyrad) parameter (radius and temperature, respectively) profiles for the first model mentioned above. These panels (along with the dotted vertical lines) show that radius humps and temperature dips coincide with the reduced χ² humps.