Mass loss flux as a function of temperature (Eq. (12)) for different materials, whose properties are listed in Table 3. Typical uncertainties (in temperature) are indicated by the error bars next to the legend. The horizontal lines mark the sublimation rates required to explain the observed tail lengths (Eq. (22)), with light grey bands indicating their uncertainties. The black-body temperatures (Eq. (16)) at the distance of the planets and their uncertainties are indicated by vertical line segments and dark grey patches.