Transparent modifications (users can keep their current use of the class without changing anything). Add a method 'getMaxY()' to get the member 'maxY_' (which is set only after having called the Draw method). Add a float input variable 'magnify' into the 'Draw' method (default value : 1.3), to replace the hardcoded value of '1.3' in the y-axis manipulations. Add a float input variable 'magnifyLog' into the 'Write' method (default value : 1.3), to manipulate efficiently the y-axis in the log stacked plot: uses pow(maxY_,magnify) as maximum on the y-axis.