a) Normalised coronal source (box in Fig. 1a) emission at EUV 94 (green squares) and 131 Å (blue diamonds), UV 1600 Å (yellow triangles), HXR at 12–25 keV (magenta horizontal lines) from RHESSI images, with the horizontal length of the lines indicating the time interval of the image. Full Sun HXR 12-25 keV (dark grey) from RHESSI is also shown for reference; b) RHESSI emission measure (EM, cm^-3); and c) temperature (T, MK) from the isothermal model for spatially unresolved (full Sun) (dark blue) and from imaging spectroscopy analysis for the coronal source (red). Vertical bars show the uncertainty from the fit and horizontal bars the time integration interval. In all panels, the vertical dashed line indicates the peak time of the HXR emission above 12 keV; d) positions (in solar X-direction) of the coronal source centroid measured from SDO/AIA 94 Å and RHESSI 12–25 keV images. Horizontal bars indicate the time integration and vertical bars show a rough estimate of the uncertainties of the HXR centroid.