Fully reduced and averaged spectra in J (top), H (middle), and K_s band (bottom) binned by a factor of 2. Green spectra show individual observing periods (most recent on top); black are averaged from all individual exposures per filter. Each spectrum has been normalized individually; offsets and flux scales are arbitrary. Regions highlighted in magenta may contain residual noise from the removal of absorption lines (mostly hydrogen) in the telluric standard. The wavelengths of some atomic and molecular absorption features of low-mass stellar objects are highlighted (Cushing et al. 2005). Regions of strong telluric absorption potentially causing residuals in the reduction are indicated by the black horizontal bars.