Best fit vibrational (black lines) and rotational (red lines) temperatures for sources with at least v_up = 1, 2 detected. The target name and disk classification (group I/II) are given in each plot title. Black points show the total amount of CO molecules per vibrational band needed to explain the detected flux assuming the distance listed in Table 1 and an averaged CO column and T_rot. Red points show an LTE distribution calculated for the averaged T_rot. Both sets are normalized on v_u = 1. The errors for the rotational temperatures are 1σ best fit contours of the summed best fit contour for all vibrational bands per source. Calculated vibrational temperature errors are 1σ values adopting a relative error of 25% in N(CO).