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      button (if necessary) to simulate the selected transitions. To
      revert
      to the
      original simulation, press the 
 button in
      the main window. Matrices of the transition moment operator are
      also displayed in this window if the selection is restricted to a
      single upper and lower state J and symmetry. If External
        Fields are present, the "J" is replaced by M and the
      symmetry is
      ignored.
    
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          Simulate selected transitions | 
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          Plot entire (selected) spectrum | 
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          Select the transition moment(s) | 
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          Select the upper manifold or state. Note that if you
            select a state here, the unselected states are excluded from
            the basis, which can significantly change the calculation. | 
        
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          Upper state J,
            Change in J,
            rovibronic
            symmetry and
            eigenvalue number. Use blank or 'all'
            to
            leave a particular setting unrestricted. | 
        
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          Lower manifold or state | 
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          Lower state J, rovibronic symmetry and eigenvalue number. Use blank or 'all' to leave a particular setting unrestricted. | 
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          Add selected lines to line list
            window | 
        
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          Replace contents of line list window with selected lines | 
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          Leave line list window unchanged | 
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          Plot selected lines | 
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          Include Perturbations in calculating transitions | 
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          For double resonance transitions, rank of excitation step | 
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          For double resonance transitions, change in J in excitation step. | 
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          |
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          Key to quantum numbers for
            basis
            states | 
        
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          When a transition of a particular upper and lower J, and symmetry, is selected, and the transition is allowed, transition moments in the undiagonalized basis are shown in this matrix, with the ground state basis shown down the left-hand side and the upper state basis shown across the top of the matrix. | 
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          |
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          Key to quantum numbers for states | 
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          Check to display the squares of the values in the matrix. | 
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          This contains the transition moments in the diagonalized basis |