A: Click on the table header to choose the columns to plot and then right click. Chose the 'Plot' option from the pop-up menu and then the type of plot you want.
You can also use the plot assistant: press 'CTRL+ALT+W' keys to show it, or go to 'View' menu -> 'Plot wizard'.
A: Right click in the plot window and chose the 'Export' option.
A: Yes, ".png" images have transparent background. See the Export Graph -> Current command command.
A: Double click on the window name will show the window maximized, even if it was hidden before.
A: Go to the Data menu and use the Select Data Range command command. Click in the plot window and use the 'Up' and 'Down' arrows keys to select the curve to analyse. Keeping 'CTRL' button and 'Left' or 'Right' arrow keys simultaneousely pressed permit to move the selected cursor and consequently to modify the data range.
A: Right click on the image you want to analyse and select the option 'View pixel line profile' from the popup menu. A dialog window opens and allows you to select the number of pixels used for the analysis. Choose a value and click "OK". Then click on the image to select the start point and move your mouse to select an end point while keeping the left button pressed. When you release the left button a plot window appears, representing the pixel intensity versus pixel index.