a) RHESSI count rates (corrected for the attenuator changes, shown), for the 2014-Feb-13 M1.8 flare, also showing several pre-flare peaks. Dotted lines indicate the zoomed-in portion in the lower panel. b) The 20–50 keV count rate averaged over the detectors (note this has not been corrected for attenuator changes), illustrating the small non-thermal peak present at ~01:35:30–01:38:00 UT. c) RHESSI hard X-ray spectrum at 01:36:16 UT, fitted with an isothermal (green) plus thick-target (blue) model. Horizontal bars show the energy binning and vertical bars the uncertainty of the data. The vertical dashed lines indicate the range of the data used in the model fitting.