Colour modulation for each of our objects. The coloured circles represent the HST data shown in the right panels of Figure 5. The dashed and solid lines are the best-fit ODR and a selection of 100 posterior ODR fits for each object. The purple-blue solid line represents the colour modulation of the 2MASS J vs 2MASS J-H’ celerité2 light curves. This has the added benefit of interpolating over the gaps left by the HST observations. The colourbar on the right shows how the colour changes as a function of time for each object. The colour modulation of a sample of 100 posterior light curves is also shown for each object in light grey. The location of the start of the observations for each object is highlighted by a black star. A red star is used to highlight the position after one period, and a white star after two periods. The start of each period is consistent for each object with more than one rotation, further supporting our chosen periods. The ODR linear fits for each object are consistent with the path traced out by the light curve modulation.