Dependence of f_fwhm, predicted by 2.5D FRADO on Eddington ratio, black hole mass, viewing angle, and shape factor. Pentagrams and circles in four right panels represent the viewing angle of 20°, and 39°, respectively. In the top-left panel, the f_fwhm is shown vs. Eddington ratio for the far-side viewed at 60°. In the bottom-left panel, the f_fwhm based on the far-side and near-side time-delays distinguished by edge colors of red and blue, respectively, is shown vs. viewing angle.