Constraints on HEZD parameters of inner disk radius R_in, total dust mass M, and grain radius of the populations of larger and smaller grains, a_L and a_S. Three approaches were used to deal with observational uncertainties: no uncertainties (, ) in blue; plus NIR, minus MIR uncertainty (, ) in gold; and minus NIR, plus MIR uncertainty (, ) in red. No markers are displayed when the respective quantity could not be constrained because the MIR excess leak was non-positive due to instrumental noise (see Sect. 3.1), no viable dust distribution was found in the investigated parameter space that is able to reproduce the observations (see Sect. 3.4), or the boundary of the chosen simulated parameter space (see Sect. 2.5) was reached (for R_in, a_L, or a_S). In addition, the first panel shows the location of the habitable zones (as defined in Sect. 2.5 of Kirchschlager et al. 2017) and the inner and outer working angles of the KIN at the respective system distances that represent the borders of the parameter space of disk radii used in the simulations. The second panel shows the total dust mass M with possible grain radii shown in the third and fourth panel. When no further restrictions were possible, the boundaries of the parameter space apply (i.e., is grain radii from 1 nm to 1 mm).