Exposure-corrected and color-coded EPIC-PN counts image of the region around HESS J1818−154. The energy bands are 0.5–2.0 keV (red), 2.0–4.5 keV (green), and 4.5–10.0 keV (blue). Over-plotted are the 90 cm radio contours of G 15.4+0.1 (blue). The five detected point sources compatible with the position and possible extent of HESS J1818−154 are marked by numbered circles (cyan). The dashed line (white, labeled “1”) shows the region used for the spectral analysis of the background.