如何分析Ghost focus generator的结果

Ghost Trace Data %i]q} M  
File : C:\Program Files\ZEMAX - Beta\Samples\Sequential\Objectives\Cooke 40 degree field.zmx _Su? VxU  
Title: A SIMPLE COOKE TRIPLET. W=M]1hy  
Units are Millimeters. 8*V3g_z  
Wavelength: 0.550000 μm 9F(<n  
Type: Double Bounces |>gya&  
The '****' denotes a possible internal focus nBgksB*A  
RMS is the RMS spot radius on axis at the primary wavelength. 5%rD7/7N  
RMS values of 0.00 indicate that an accurate RMS /(bPc12  
could not be computed, usually due to ray errors. ?i>.<IPOq  
This analysis may be inaccurate if the system is l`:M/z6"  
non-rotationally symmetric or uses non-standard surfaces. &y[Od{=  
Ghost reflection off surface 2 then 1. (GH002001.ZMX) u%Bk"noCa  
Surf     Marginal          F/#          RMS 0V uG(O  
   1  5.0000E+000     5.737068  3.5355E+000 nr
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   2  4.7160E+000     4.595701  3.3570E+000 <Qe30_<K  
   1  4.3614E+000     0.990012  3.1277E+000 .RxH-]xk  
   2  2.7155E+000     0.607262  1.9876E+000 ,P3nZ  
   3 -2.2309E+000     0.916280  2.6065E+000 s(w6Ldi  
   4 -2.7766E+000     0.514753  0.0000E+000 oP$NTy[  
   5 -7.3909E+000     0.888038  0.0000E+000 v/ dSz/<]  
   6 -9.0530E+000     0.823473  0.0000E+000 u7=`u/  
   7 -3.4681E+001     0.823473  0.0000E+000 QmvhmsDL  
Marginal ray height    :       -34.6809 >)YaWcI  
Chief ray height       :       -24.8107 zqh.U@  
Distance to ghost pupil:       -50.9613 t|0Zpp;  
Distance to ghost focus:       -57.1176 Vahfz8~w/  
Effective focal length :         8.2347