Three-example J-band spectra of spectral type L3 objects from the BDSS. Each spectrum represents a different gravity type: low gravity (2MASS 2208+2921), intermediate gravity (2MASS 1726+1538), and high gravity (2MASS 1300+1912). Major absorption features in the J band are also labeled. Light gray shaded regions denote the locations used to calculate K I equivalent widths and the FeHJ index. Dark gray regions denote the locations of the pseudocontinua used in our calculations. The K I line at 1.2437 μm is marked but not shaded. This line was not used to determine gravity types because of contamination from FeH absorption at ∼1.24 μm (E. C. Martin et al. 2017).