Characteristic angle of the tail’s decay as a function of grain size (Eq. (19c)) for KIC 1255b and KOI-2700b, with different colours for different materials. Dashed lines indicate that particles sublimate entirely before completing one orbit. Gaps (neither a solid nor a dashed line) appear where particles are unbound (β ≥ 0.5). Typical uncertainties are shown by the error bars at the bottom of each panel. The horizontal black lines indicate the values of Δθ_tail derived from the observed light curves.