Example of a synthetic binary template with S/N = 116 (black line), constructed from an S/N = 124 L5 dwarf spectrum (magenta line) and an S/N = 99 T5 dwarf spectrum (blue line). The fluxes of the single components are scaled relative to each other using the T. J. Dupuy & M. C. Liu (2012) M_J/spectral type relation, and to the combined spectrum, which is normalized between 1.20 and 1.35 μm. The uncertainty for the combined-light spectrum is shown as a dashed–dotted line, and the vertical gray bands indicate regions of strong telluric absorption.