Top: CLEAN image of the 2011 Feb 24 flare. The dot-dash lines show the looptop (LT) and footpoint (FP-N, FP-S) regions used to produce spectra. The red contours show the looptop emission in the 10.0–11.4 keV (30%, 50% and 75%) energy band overplotted over the CLEAN image in the same range. The footpoint emission at 40.8–46.4 keV is shown by the blue contours (30%, 50% and 75%). Also shown are photon X-ray spectra for the flare: bottom left, looptop spectrum; bottom middle, summed footpoint spectrum; and bottom right, full-Sun spectrum. HXR spectrum is shown as black data points. Fitting result is shown by the magenta line and is composed of a thermal (orange) and thin-target (green) component, with an albedo correction (blue) for the footpoint and full-Sun spectra. The full-Sun spectrum also shows the background emission in grey. The range fitted for each case is shown by the vertical dashed lines.