Top panels: pulse profiles of Swift J1816.7–1613 in five different energy bands 3–7, 7–18, 18–30, 30–50, and 50–79 keV (from top to bottom) obtained with the NuSTAR observatory. The fluxes are normalized by the mean flux in each band. The position of the main maximum and minimum are shown by vertical dashed and dotted lines, respectively. The zero phase was chosen arbitrarily. Bottom panel: hardness ratio of Swift J1816.7–1613 pulse profiles in the energy bands 7–18 and 3–7 keV. The blue horizontal line indicates the hardness ratio of unity.