Visualization of the RADEX fit to the four CO and ¹³CO lines at the F1 position in Draco. Each plot shows a constant temperature cut through the three dimensional distribution of line intensities and χ² values. The kinetic temperature of the χ² minimum, that is, 9 K (see Table 8) was used. The colors in the plot show the integrated line intensities for the four lines, the observed value is marked by a red line. The gray contours give χ² values of 8, 16, 32, 64, and 128. As the χ² distribution is a global property, those contours are the same in all four subplots.