H.E.S.S. spectrum (green points) and eROSITA flux upper limit for the HESS J1702-420B-shape region (blue circle, upper limit) and for the 1.5°-radius disc-shape (red square, upper limit) region. The components of the leptonic model are shown with solid (IC) and dash-dotted (synchrotron) blue lines. The synchrotron component is shown for the 95% c.l. excluded value of the magnetic field (∼1.5 μG); see Sec. 2.2 for the details. The components of the Aharonian et al. (2023) model are shown with solid (π⁰-decay) and dash-dotted (synchrotron emission from secondary electrons) red lines. The shaded region illustrates the expected scatter of X-ray fluxes in the Aharonian et al. (2023) model for B = 10 − 100 μG.