Reliable source around the galaxy J1253-12. The stacked spectrum and its 9-channel boxcar smoothed version are given in blue and red, respectively. The detected source is highlighted. The horizontal grey dashed lines are the ±σ level for the unsmoothed spectrum, while the black dashed line is the 0-flux level. The vertical black dashed-dotted line is, instead, the 0 km s−1 reference velocity. The galaxy name and the cell size are provided in the bottom-left corner, while at the bottom-right is reported if the detection was also visually identified in its corresponding cube.