Diagnostic plots for the laser candidate in the spectrum of WASP-1 with the same format as Figure 4. The candidate laser feature is narrower than the instrumental profile in the wavelength direction and narrower than the spatial profile of the star, both discrepancies indicating that the feature did not originate from light passing through the spectrometer. A zoom-in on the central 12 × 5 pixels is superimposed on the raw CCD image to emphasize the lack of a noticeable peak in all but the central row. See Figure 14.