Comparison of STIS transmission spectra of WASP-178b obtained following different data analysis procedures. The black empty diamonds show the transmission spectrum obtained using the ‘multiple jitter parameter’ method (‘Multiple JP’). The blue and green empty diamonds show, respectively, the results obtained from the ‘one jitter parameter’ analysis methods considering a lower (‘1 JP lower order time’) and higher (‘1 JP higher order time’) polynomial order in time, with the latter being favoured by the BIC. For each of these, the filled squares show the transmission spectra obtained binning at UVIS resolution. For comparison, the red empty diamonds show the transmission spectrum presented by Lothringer et al. (2022, priv. comm. from the authors). The grey circles show the UVIS transmission spectrum from Lothringer et al. (2022). The horizontal grey dashed line indicates the broad-band R_p/R_s obtained from EulerCAM (Hellier et al. 2019).