Representative synthetic spectra of hot DQ white dwarfs taken from our model grid for various effective temperatures, gravities, and helium and hydrogen abundances. The spectra are normalized to unity at 4200 Å and offset by an arbitrary factor for clarity. The labels indicate the effective temperature, while the color of each spectrum corresponds to a different gravity, as indicated in the lower left corner. The bottom two examples show the influence of trace helium [﹩\mathrm{log}\,( \mathrm{C}\,/ \mathrm{He}\,) =2﹩, 1, and 0] and trace hydrogen [﹩\mathrm{log}\,( \mathrm{C}\,/ \mathrm{H}\,) =2﹩, 1, and 0], while in blue, we show the ﹩\mathrm{log}\,g=8﹩ synthetic spectra for pure helium atmosphere (DB) and pure hydrogen atmosphere (DA).