*-- Author :    John V. Morris
      FUNCTION FM2SOV(T)
************************************************************************                                      
*                                                                      *                                      
* Symmetric double Gaussian plus quadratic background.                 *                                      
*                                                                      *                                      
* JVM  31/7/91                                                         *                                      
************************************************************************                                      
                                                                        
*KEEP,FCOMF.                                                                                                  
      PARAMETER( NP = 8 )            ! number of fit parameters         
      COMMON/FCOMF/PAR(NP),STAG                                         
*KEND.                                                                                                        
                                                                        
* PAR(1 to 3) ; Background = PAR(1) + PAR(2)*T + PAR(3)*T**2                                                  
* PAR(4)      ; Lower peak height                                                                             
* PAR(5)      ; Upper peak height                                                                             
* PAR(6)      ; Drift Velocity in microns/nsec                                                                
* PAR(7)      ; Timing Resolution in nsec                                                                     
* PAR(8)      ; Asymmetry in nsec                                                                             
                                                                        
      RMS = 0.5*SQRT(5.)*PAR(7)                                         
      SEP = 2.0*STAG/PAR(6)                                             
      FM2SOV = 0.0                                                      
                                                                        
      B   = PAR(1) + PAR(2)*T + PAR(3)*T*T                              
      IF( B.GT.0. ) THEN                                                
      FM2SOV = B                                                        
      ENDIF                                                             
                                                                        
      F1  = ( (T+SEP+PAR(8))/RMS )**2                                   
      IF( F1.LT.50. )THEN                                               
      FM2SOV = FM2SOV + PAR(4)*EXP( -0.5*F1 )                           
      ENDIF                                                             
                                                                        
      F2  = ( (T-SEP+PAR(8))/RMS )**2                                   
      IF( F2.LT.50. )THEN                                               
      FM2SOV = FM2SOV + PAR(5)*EXP( -0.5*F2 )                           
      ENDIF                                                             
                                                                        
      RETURN                                                            
      END                                                               
*