Sensitivity check of the used formalism for five parameters: d, f_H,CO, T _⋆, L _⋆ (R _⋆), and R_inner. The upper left panel gives the estimates based on the input parameters of the model and the output values of the integrated intensities I^g,cc. The grid values for the different parameters and the colour coding are specified in the legend of every panel. The dash-dotted line in all panels marks the model’s input-Ṁ, 10^-7 M_⊙  yr^-1, the dashed lines mark a factor three difference w.r.t. this value.