Reliability plot of the sources detected in the J1318-21 full-depth cube (intermediate cell size). Left panel: $\frac{F_{\mathrm{sum}}}{\sigma }$ vs. $\frac{F_{\mathrm{peak}}}{\sigma }$ projection of the ($\frac{F_{\max }}{\sigma }$, $\frac{F_{\mathrm{sum}}}{\sigma }$ and $\frac{F_{\mathrm{mean}}}{\sigma }$) parameter space. Blue, pink and black points are the positive, negative and reliable sources, respectively, detected in the 225 stacked spectra computed for the J1318-21 full-depth cube when using the intermediate cell size. The solid, dashed and dash-dotted black ellipses represent, respectively, the two-dimensional 1, 2 and 3 times the standard deviation of the source distribution. Centre panel: $\frac{F_{\mathrm{mean}}}{\sigma }$ vs. $\frac{F_{\mathrm{peak}}}{\sigma }$ projection. Right panel: $\frac{F_{\mathrm{mean}}}{\sigma }$ vs. $\frac{F_{\mathrm{sum}}}{\sigma }$ projection. The dashed dark-grey line is the minimum S/N of a source in order to be considered reliable.