Dimensionless CIB dipole. The solid line, marked “CIB”, shows the dimensionless IGL–CIB dipole from the Flagship2.1 catalog in the configuration used here combining the configuration given by Eqs. (9) and (10). The figure assumes that V = V_CMB, with the CMB dimensionless dipole marked with the thick horizontal dashed line. The Euclid filters are shown with the filled circles showing the values at their nominal wavelengths. The RomanF213 filter covering photons just outside of the H_E NISP band, JWST F210M and F277W filters also near and longward of the H_E band, and Rubin’s g, r, i, and z filters are also shown. With this additional coverage the value of α_ν can be evaluated to good accuracy. The two shortest wavelength Spitzer IRAC filters at 3.6, 4.5 μm are marked with pink dotted lines.