Left: Hα emission of SNR G326.3−1.8 obtained from the Southern H-Alpha Sky Survey Atlas (Gaustad et al. 2001). The radio contours of the whole SNR are overlaid in white. Right: multiwavelength modeling in the hadronic scenario with two contributions: a main shock (solid lines), and a radiative shock (dashed lines). The radio points are extracted from Dickel et al. (2000), the ROSAT and the H.E.S.S. upper limits come from Kassim et al. (1993) and H.E.S.S. Collaboration et al. (2018) respectively. The values of the parameters are reported in Table 4.