Flux difference between the two observations of NGC 1346: Obs1 (August 12) and Obs2 (September 4). The Obs2 continuum was normalized to the Obs1 continuum by multiplying Obs2’s total flux by 0.905, before the two spectra were subtracted. The centroid of the Hα (6563 Å) and Hβ (4861 Å) emission lines in air are indicated. A feature due to telluric absorption, which could be misinterpreted as an emitted broad line, is indicated. Observational errors are indicated in transparent gray.