Left panel: Lyα map of Mrk 1486 and the position of the COS aperture (thick red circle). We also add the location of each ISM region identified in Fig. 5. Right panel: the Lyα line profile of Mrk 1486 within the COS aperture. The x-axis shows the rest-frame wavelength. The Lyα line profile exhibits a P-Cygni profile in which three significant peaks can be identified (listed by numbers on top of the Lyα line profile). Finally, different LIS and HIS absorption lines from the ISM of Mrk 1486 (red lines) and the Milky Way (green lines) are identified in the COS spectrum.