... Clicking on PLOT S CREEN will display the plot. At this stage, you can fit functions to the data ( FIT : the residuals are plotted and can be manually edited), enter a new plot range (R ANGE : enter 0,0 for automatic scaling) or by defining a window (W INDOW : click left button to anchor upper left corner, click middle button fix size and shift box, click left button again to fix position or right button to select automatic scaling and exit), identify ...