

 ** HOW TO DEFINE RANGE:
   
   One can define the spectral range to be treated in
   several ways:

 ** NUMERICALLY:

   - Defining RANGE, for example, 10,25 (or 10.0,25.0 or 25.,10 
     or ...) displays the spectral range between 10 and 25 Hz.
   - A single frequency, for example, 20.0, adjusts the range so
     that the midpoint of the arnge is at 20.0 Hz.

 ** With the LETTER KEYS:

   - E expands the spectrum by a factor of two, C compresses the 
     spectrum. If want to change the scaling factor (default = 2)
     give, for example, 1.2E to expand the spectrum by a factor
     of 1.2. The scaling factor is valid so long as it is redefined 
     or W is used.
   - W displays whole the spectral range.
   - R moves the spectrum to right, L to left. The default shift is
     0.50% of the range. If want to change the shift, for example,
     1.1R moves the spectrum by 10%.
   - In DP cntrl-R adjusts the range so that first observed line
     at right is brought to the screen.
   - T moves the spectrum so that the highest signal is brought 
     to the midlle of the frequency scale.
   - I, i, D, and d change the Y-scalings (see cursors).

 ** With the CURSORS:

   - The cursors are moved with the CURSOR keys: <left> and <right>
     move the LEFT cursor, CNTRL-<left> and -<right> move the RIGHT
     one. ALT-<left> and -<right> move the both.
   - The cursor range is expanded with the <space> or F2-key. 
   - The cursors are removed and set to the left and right ranges 
     with the F5-key.
   - In the  ASSIGN mode of DP there are two types of cursors (the
     frequency cursors and the peak-top cursors). The control
     between these cursors is handled with the F3-key.
   - The <up>-cursor expands the intensity, <down>-cursor compresses 
     it. The CNTRL- and ALT-keys shift the base-line level.


 ** HOW TO ASSIGN:

    - Set the LOWER cursor ('the main cursor') with the CNTRL-
      cursor keys to the theoretical transition you want to assign.
    - Move the UPPER cursor with the cursor keys and press A to
      assign. The cursors are then moved automatically to the
      next transition and the corresponding peak-top.
    - The ALT-cursor keys move both the cursors.
    - If there are several nearly degenerate transitions close to
      each others (seen from the window at the left corner), use
      ALT-A to assign all of them. BE CAREFUL NOT TO ASSIGN WEAK
      COMBINATION LINES HIDDEN UNDER THE STRONG MAIN TRANSITIONS.
    - CNTRL-A assigns automatically all the lines on the screen.
    - F9 removes the assignment defined by the LOWER cursor, F10
      removes all the assignments on the screen. F8 removes the
      assignments done by ALT-A.
