Inset: the normalised pulse energy distribution of the combined 2005 data sets (solid histogram), and that of the off-pulse region (dotted histogram). The latter is scaled down by a factor three to make their amplitudes comparable. Main panel: the similarly normalised energy distribution of the Q (thin dashed histogram) and B mode (thick solid distribution) are shown separately. The fitted distribution functions are shown as the thin solid (B mode) and dashed curve (Q mode).