K2-18 source detected on PN-CCD, MOS1, and MOS2 is marked by the dashed black circle region of 20 arcsec with its coordinates, while the dark region below corresponds to a quasar. The image is displayed with a smoothing parameter of 1.5σ. Note that the efficiency/sensitivity of MOS2 is lower than that of MOS1 (Mineo et al. 2024). In PN, the source lies in a chip gap, while it is unobstructed in MOS1 & MOS2. The X-ray flux was derived in the same way for both MOS and PN detectors.