While in review mode several actions are possible by means of the buttons at the
bottom of the screen (e.g. adding or removing signals, creating, editing and
removing markers, zooming in and out, moving through the graphs, making
prints and screen shots, exporting data, etc.). The functions of these buttons are
explained in more detail in A1.4.1.
In general the button has to be selected and subsequently the graph has
to be clicked in order to perform the action