 Of a total of  25000 rays, of which   6250 formed the input set 
      0 were out of the mirror N.    1
 The mirror collects   1.0000     of the incoming flux.
 The average reflectivities are :
 S-pol                      0.86823    
 P-pol                      0.86821    
 Total                      0.86822    
 The overall efficiency of the mirror is : 0.86822    
