如何分析Ghost focus generator的结果

Ghost Trace Data %`HAg MgP  
File : C:\Program Files\ZEMAX - Beta\Samples\Sequential\Objectives\Cooke 40 degree field.zmx O} QTg  
Title: A SIMPLE COOKE TRIPLET. G(|ki9^@"9  
Units are Millimeters. >mT2g  
Wavelength: 0.550000 μm J`uV $l:  
Type: Double Bounces ar=uDb;  
The '****' denotes a possible internal focus s{KwO+UW  
RMS is the RMS spot radius on axis at the primary wavelength. v%=G~kF}[  
RMS values of 0.00 indicate that an accurate RMS +QuaQ% lA  
could not be computed, usually due to ray errors. @xB"9s  
This analysis may be inaccurate if the system is 2>.B*P  
non-rotationally symmetric or uses non-standard surfaces. c&AA< 6pkv  
Ghost reflection off surface 2 then 1. (GH002001.ZMX) +l2{EiQw  
Surf     Marginal          F/#          RMS UbJ_'>hK6  
   1  5.0000E+000     5.737068  3.5355E+000 Cz Jze  
   2  4.7160E+000     4.595701  3.3570E+000 yu<sd}@  
   1  4.3614E+000     0.990012  3.1277E+000 ,K6s'3O(LW  
   2  2.7155E+000     0.607262  1.9876E+000 _*9eAeJ  
   3 -2.2309E+000     0.916280  2.6065E+000 A/W0O;*q  
   4 -2.7766E+000     0.514753  0.0000E+000 %-i2MK'A  
   5 -7.3909E+000     0.888038  0.0000E+000 wvcG <sj  
   6 -9.0530E+000     0.823473  0.0000E+000 7:R8QS9  
   7 -3.4681E+001     0.823473  0.0000E+000 %[-D&flKC  
Marginal ray height    :       -34.6809 d>)*!l2,C  
Chief ray height       :       -24.8107 z(aei(U=  
Distance to ghost pupil:       -50.9613 H{E223  
Distance to ghost focus:       -57.1176 Qy*`s  
Effective focal length :         8.2347