Synthetic intensities for the simulation that reproduces the observations of the rain bow best. (a) Intensity in the 171 Å (red), 193 Å (green), and 335 Å (blue) bands of SDO/AIA as a function of the position along the loop and time. The black contour shows regions where the temperature is lower than 0.5 MK. (b) Intensities in the six coronal channels of AIA, integrated close to the apex, (370 Mm < s < 380 Mm). Each light curve was normalised by subtracting its average and dividing by its standard deviation. (c) Temperature-response function of the SDO/AIA channels shown in panel (b).