Spectra (F_λ) of model atmospheres of giant planets for different effective temperatures (colored solid lines, BT-Settl models from Allard et al. 2012). Each spectrum is normalized to its value at 1.6 μm and is vertically shifted by a constant. The transmission of the three SDI filters of NaCo (T₁, T₂, and T₃) are shown in black lines with different styles. Theoretical absorption bands of water and methane are also indicated. The vertical scale is linear.