Time-resolved properties, with 1σ errors, of the thermonuclear X-ray burst observed from IGR J17591–2342 with AstroSat/LAXPC (see section 4.2.3). The blackbody parameter (radius and temperature) and reduced χ² profiles are shown for three cases: (i) fitting of 1 s burst spectra with the XSPEC model tbabs(bbodyrad+powerlaw+gauss+gauss) (panels a1, a2, a3); (ii) fitting of 1 s burst spectra with the XSPEC model tbabs(bbodyrad+constant*Nthcomp+gauss+gauss) (panels b1, b2, b3); and (iii) fitting of 2 s burst spectra with the XSPEC model tbabs(bbodyrad+constant*powerlaw+gauss+gauss) (the second Gaussian in ∼12 − 20 keV is included if required; panels c1, c2, c3). For (ii) and (iii), Comptonization (Nthcomp) and power-law parameter values were frozen to the pre-burst values (Section 3). This figure shows that the second blackbody radius hump aligned with a temperature dip is present for multiple reasonable models and spectra for different time bin sizes, and is thus robust.