Spectral fitting for the thermonuclear X-ray burst observed from IGR J17591–2342 with AstroSat/LAXPC (see Section 4.2). The spectrum is for 8 − 10 s since the burst onset, and the XSPEC model is tbabs(bbodyrad+constant*powerlaw) with the powerlaw parameter values frozen to the pre-burst values (Section 3). Upper panel: Unfolded spectrum. Data with 1σ errors are shown in red. The total model (solid histogram), tbabs*bbodyrad component (dashed line), and tbabs*constant*powerlaw component (dotted line) are also shown. Lower panel: Data-to-model ratio with errors. This figure shows that this model is not adequate because there are two excesses in the ∼6 − 8 keV and ∼12 − 20 keV ranges.