|  | Upper limit on the number of
            lines displayed 
 | 
        
          |  | Discard lines that are weaker
            than the indicated fraction of the strongest lines. 
 | 
        
          |  | Lines calculated with exactly
            zero intensity (which may well be forbidden in the absence
            of specific interactions) are not displayed in the line list
            unless this is unchecked. 
 | 
        
          |  | When right clicking on a line in a simulated
            spectrum that is already in the line list, do not add to the
            list if this option is selected. If no lines are added by a
            right click, the first duplicate line is selected in the
            line list window. To always add lines, turn off "Discard
            Duplicates" or use Shift+Right Click for a one-off override. | 
        
          |  | Sort order when adding from transitions
            window | 
        
          |  | When measuring and assigning
            lines with the mouse, only assign lines stronger than the
            given fraction of the strongest. |