Temporal evolution of the geometric HXR source parameters as determined by the four different image reconstruction methods, shown for the example of the M8.2 flare of 2002 Apr. 10. The top row shows the major and minor axes wa,th and wa,th, area Ath, and volume Vdir of the thermal source. The middle and bottom rows show the axes wa,nth and wb,nth, and areas Anth of the two footpoint sources, as well as the thermal volume Vind and the footpoint separation dFP.
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