hi, The online help of /gate/output/plotter/ will show some information like this:  Commands :  1) describe * List of the outputModule properties  2) verbose * Set GATE output module verbose level  3) enable * Enables '/gate/output/plotter/'.  4) disable * Disables '/gate/output/plotter/'.  5) reset * Reset the output  6) addPlot * Add a plot to the plotter  7) removePlot * Remove a plot from the plotter  8) removeAllPlots * Remove all plots from the plotter  9) listPlots * Remove all plots from the plotter  10) setPlotWidth * Set the width of the single plot  11) setPlotHeight * Set the width of the single plot  12) setNColumns * Set the width of the single plot  13) plotAll * Plot all plots in the plotter  14) showPlotter * Open (if needed) the plotter window  15) closePlotter * Open (if needed) the plotter window The description of  line 12) and 15) seems wrong. yuxuan