如何分析Ghost focus generator的结果

Ghost Trace Data fo/sA9  
File : C:\Program Files\ZEMAX - Beta\Samples\Sequential\Objectives\Cooke 40 degree field.zmx <~v4BiQ3l^  
Title: A SIMPLE COOKE TRIPLET. u|"YS-dH  
Units are Millimeters. @raJB'  
Wavelength: 0.550000 μm 1
7;9>*O'  
Type: Double Bounces j1+I_  
The '****' denotes a possible internal focus %'=TYvB 2  
RMS is the RMS spot radius on axis at the primary wavelength. F2<Q~gQ;  
RMS values of 0.00 indicate that an accurate RMS (~F}O  
could not be computed, usually due to ray errors. uP8 cW([  
This analysis may be inaccurate if the system is e(1{W P  
non-rotationally symmetric or uses non-standard surfaces. VTDnh*\5  
Ghost reflection off surface 2 then 1. (GH002001.ZMX) ^:f)XZ  
Surf     Marginal          F/#          RMS /L! =##  
   1  5.0000E+000     5.737068  3.5355E+000 C deV3  
   2  4.7160E+000     4.595701  3.3570E+000 4PU@W o  
   1  4.3614E+000     0.990012  3.1277E+000 &n83>Q  
   2  2.7155E+000     0.607262  1.9876E+000 oHSDi  
   3 -2.2309E+000     0.916280  2.6065E+000 P&Xy6@%[Z  
   4 -2.7766E+000     0.514753  0.0000E+000 |@R/JGB^  
   5 -7.3909E+000     0.888038  0.0000E+000 R&P^rrC@B5  
   6 -9.0530E+000     0.823473  0.0000E+000 9M|#X1r{%{  
   7 -3.4681E+001     0.823473  0.0000E+000 U%VFr#  
Marginal ray height    :       -34.6809 ]eFNR1<OP  
Chief ray height       :       -24.8107
b!"qbC1  
Distance to ghost pupil:       -50.9613 N5cC!K  
Distance to ghost focus:       -57.1176 aGE} EK}  
Effective focal length :         8.2347