Robustness analysis for STIX images (20–40 keV) of the late HXR peak (HXR peak 6; 11:37:19–11:38:11 UT). Left, from top to bottom: unperturbed image contours (blue) from forward fitting a model of one, two, and three circular sources, respectively, MEM_GE, and Clean on top of the closest EUI FSI 174 Å image (same as Fig. 2) and AIA 1600 Å contours. Right: image contours of 20 reconstructions from perturbed visibilities (gray) and their mean (purple). Forward fit contours show 30, 50, 70, and 90% levels, while MEM_GE and Clean show 50, 70, and 90% levels.