SED of PSR J1932+2121 at the phase of shock flow along the LOS, shown for the MR (left) and PL magnetization decay (right) models. The shaded region indicates the uncertainty associated with the source distance, taken to be 1.5 ∼5.1 kpc by Misra et al. (2025), while the solid line running through the middle of each shaded region corresponds to the calculation with the adopted average distance of 3.3 kpc. The sensitivity limits for Swift, EP/FXT, XMM/EPIC, and eXTP/SFA are adopted from Burrows et al. (2005), Yuan et al. (2022), Traulsen et al. (2019), and Zhang et al. (2019), respectively, assuming representative exposure times of 1–100 ks. The upper limits of Fermi/LAT are from Werner et al. (2013) and are shown as an additional constraint on the high-energy tail of the spectrum.