如何分析Ghost focus generator的结果

Ghost Trace Data g3%x"SlIU  
File : C:\Program Files\ZEMAX - Beta\Samples\Sequential\Objectives\Cooke 40 degree field.zmx 8<Yv:8%B6  
Title: A SIMPLE COOKE TRIPLET. :(3'"^_NA  
Units are Millimeters. ~fcC+"7q/  
Wavelength: 0.550000 μm TBF{@{.d  
Type: Double Bounces "? V;C  
The '****' denotes a possible internal focus gr.G']9lNq  
RMS is the RMS spot radius on axis at the primary wavelength. :l Z\=2D  
RMS values of 0.00 indicate that an accurate RMS @RoU
 
could not be computed, usually due to ray errors. -{d(~XIo  
This analysis may be inaccurate if the system is B"*PBJuOA  
non-rotationally symmetric or uses non-standard surfaces. #zSNDv`  
Ghost reflection off surface 2 then 1. (GH002001.ZMX) _x!/40^G  
Surf     Marginal          F/#          RMS K@osD7-  
   1  5.0000E+000     5.737068  3.5355E+000 vt(n: Xk  
   2  4.7160E+000     4.595701  3.3570E+000 o?.VW/"  
   1  4.3614E+000     0.990012  3.1277E+000 Z.aeE*Hs$  
   2  2.7155E+000     0.607262  1.9876E+000 v6x jLP;O  
   3 -2.2309E+000     0.916280  2.6065E+000 NP~3!b  
   4 -2.7766E+000     0.514753  0.0000E+000 ,L>{(Q)  
   5 -7.3909E+000     0.888038  0.0000E+000 yC|odX#  
   6 -9.0530E+000     0.823473  0.0000E+000 SwrzW'%A  
   7 -3.4681E+001     0.823473  0.0000E+000 * "
?,
.  
Marginal ray height    :       -34.6809 Xo.3OER  
Chief ray height       :       -24.8107 SST@   
Distance to ghost pupil:       -50.9613 f|s,%AU"i  
Distance to ghost focus:       -57.1176 76c:*bZ  
Effective focal length :         8.2347