The D₂₅ (left) and L_B (right) relations along with 1σ uncertainties (shaded regions) for the HI science sample (dashed black line), the sample with SDSS spectroscopic isolation criteria (light blue), the sample with SDSS photometric isolation criteria (green), the HI science sample with corrected NRT and ERT fluxes (purple), and with NRT and ERT observations removed (red). Offsets have been applied to the relations (except the central relation, the HI science sample) to aid readability. The HI science sample relation is duplicated each time for comparison.