Comparison of the major axes w_a,th (FWHM) of the thermal sources for all flares and time intervals. Measurements obtained from the four different image reconstruction algorithms (LN, PIX, VFF, MNJ) are plotted against each other. Only cotemporal measurements are included. Also shown are power-law fits using the OLS bisector method (dashed lines), the slope and intercept of the obtained power-law, α and b, the linear correlation coefficient, C, and the number of value pairs, N. The dotted lines denote x = y. At the bottom of the plots, the mean ratio (⟨ .../... ⟩) of w_a,th obtained from the two methods that are compared is shown.