Effects of selected stellar, gas, dust and disk shape parameters on CO fundamental emission line profiles. Each part figure shows mean line profiles averaged over all computed CO υ = 1 → 0R-branch and P-branch emission lines, continuum subtracted and convolved with a 12 km s^-1 Gaussian (resolution R ≈ 25 000). The thick full lines show the reference model, identical in every part figure. The shaded areas indicate the changes caused by single parameter variations, where the dashed and dotted lines correspond to the changed parameter values as annotated. Non-depicted parameters have less influence on the CO fundamental emission, for example the X-ray luminosity L_X, compare Fig. 18.