Peak-to-peak amplitudes in J against BJD−2450000, illustrating the long-term evolution over several epochs for a number of strong variables in the literature with multi-epoch observations. The first epoch plotted is for J0136 in 2008-09-21, amplitude uncertainties are indicated by error bars and epochs with upper/lower limits are plotted with triangles. One object, the T6 J2228 stands out as being relatively stable, indicated in the legend by SD_AJ, the standard deviation (SD) for a given object obtained from the SD of all epochs normalised by the maximum amplitude.