Color–color diagrams for B1 (left) and B2+B3 (right). Black data points are from the spectra displayed in Fig. 13. The solid black (slightly curved) line is a JP model with α_inj = −0.6, the dashed black line a JP model with α_inj = −0.7, the solid red line a KP model with α_inj = −0.6, the dashed red line a CI model with α_inj = −0.6, and the blue line a KGJP model with α_inj = −0.7. The grey data points are for the same data as the black points, except the maps were smoothed with a 60′′ FWHM Gaussian. The line is also shown for reference.