Plotting Principal Tensor components for PDY studies

Special plots used here for pharmaco-EEG studies when using PTA-$k$modes with the choice of modes devised above are described as follows. Plot of lead mode (also called electrode mode or spatial mode) is the map of the leads with size of characters proportional to coordinates, in red (dark) for positive coordinates in cyan (clear) for negative coordinates. When appropriate a one dimensional (horizontal) plot of subject*dose mode is artificially split vertically according to dose membership joining each different the same subject across in order to describe the profiles, the mean at each dose is also plotted with a character size proportional to the standard deviation of the dose group. This last plot is sometimes stacked with the plot of bands (again artificially spread vertically). As the components are normalised to one, only the relative differences within the components are of interest and the sign of the values: the indications on the axe may be limited to positioning the zero (vertical line).