Extraterrestrial laser candidate found in an observation of the T Tauri star, TW Hydrae. See Figure 4 and the text for an explanation of the panels. The two peaks represent [O I] in the terrestrial night sky (left) and redshifted in the chromosphere or protostellar disk of TW Hydrae. The code is tuned to ignore known transitions such as this, but the redshift pushed the candidate outside of the regime of exclusion.