Synthetic X-ray Telescope (XRT) Al-poly/open images of the flare current sheet as observed from different perspectives at t = 8.2. Panel (a): Edge-on view, with the LOS in the z-direction. θ denotes the acute angle between the LOS and the z-axis. The gray boxes in all panels enclose a plasmoid as also highlighted in Fig. 1. The optical thin assumption has been adopted for synthesizing (see Wang et al. 2023b, for details). Panel (a): Two x-direction slits used to analyze the apparent and physical widths in Figs. 3 and 4. The three dots mark the ends of three slits along the z-direction used in Fig. 8. The spatial resolution of XRT is 2 arcsec (∼1500 km; Golub et al. 2007), corresponding to 0.03L₀ in the simulation.