Fluctuation analysis of the emission including both modes of PSR B1839−04, and those of the Q and B mode separately. These are the combined 2005 data sets, rebinned with a factor 9 in pulse longitude. Top row: the pulse profile and the modulation index (points with error bars). Second row: the LRFS and a side panel showing the horizontally integrated power. Third row: the 2DFS of component I and side panels showing the horizontally (left) and vertically, between the dashed lines, integrated power (bottom). Bottom row: the 2DFS of component II. Third column: the 2DFS of Q-mode emission of component II with an adjusted vertical range and grey-scale emphasizing the second harmonic.