Top-left: Contours of STIX images reconstructed for time interval 11:21:06–11:22:06 UT. Top-right: centroids of sources within a dotted box on the left panel. Linear fits to positions and perpendicular preliminary reference levels are marked accordingly. Energy is color-coded the same way on both panels. Bottom: Energy-altitude relation obtained for points marked in Figure 4. The altitudes have been estimated for corrected reference level, thus they are altitudes above the top of the photosphere. The bump is marked by green square.