Relative change in diameter (top) and visible geometric albedo (bottom) as a function of the relative change in the beaming parameter for MC asteroid (90943). We took the fitted value of η obtained from the first group of observations (labelled n_W3, n_W4> 9) as reference and fitted diameters using different fixed η values (up to ±40%) for three groups of observations. The label n_W3, n_W4> 9 means that W3 and W4 data were available (more than 9 data points in each band), n_W3> 0 indicates that the diameter was only fitted to 12 μm (W3) data, and n_W3 = 0, n_W2> 0 only to 4.6 μm (W2) data only. We note the different scales in the panels.