Bond order in gaussian



 Dear All
 I am try to do a bond order analysis with G98.
 	Here is my test with O2 molecule.
 #B3LYP/6-31G opt pop=(NBO,Bonding)
 HF
 0 3
 O   0.00 0.00 0.000000
 O   0.00 0.00 1.200000
 The last lines of the output file is below, and I don't think it is right.
 How can I read the table correctly?	And what the LP,RY* stand for?
     Thank you very much for your help!!!!!!!!!!!!!!!!!
  Natural Bond Orbitals (Summary):
                                                      Principal Delocalizations
            NBO              Occupancy    Energy      (geminal,vicinal,remote)
  ===============================================================================
 	 Molecular unit  1  (O2)
    1. BD ( 1) O 1- O 2       1.00000    -1.03224
    2. BD ( 2) O 1- O 2       1.00000    -0.45369
    3. BD ( 3) O 1- O 2       1.00000    -0.45369
    4. CR ( 1) O 1            0.99997   -19.14436    12(v)
    5. CR ( 1) O 2            0.99997   -19.14436    8(v)
    6. LP ( 1) O 1            0.99984    -0.87950    12(v)
    7. LP ( 1) O 2            0.99984    -0.87950    8(v)
    8. RY*( 1) O 1            0.00019     0.95747
    9. RY*( 2) O 1            0.00000     0.88719
   10. RY*( 3) O 1            0.00000     0.88719
   11. RY*( 4) O 1            0.00000     1.07773
   12. RY*( 1) O 2            0.00019     0.95747
   13. RY*( 2) O 2            0.00000     0.88719
   14. RY*( 3) O 2            0.00000     0.88719
   15. RY*( 4) O 2            0.00000     1.07773
   16. BD*( 1) O 1- O 2       0.00000     0.26370
   17. BD*( 2) O 1- O 2       0.00000    -0.13403
   18. BD*( 3) O 1- O 2       0.00000    -0.13403
        -------------------------------
               Total Lewis    6.99962  ( 99.9946)
         Valence non-Lewis    0.00000  (  0.0000)
         Rydberg non-Lewis    0.00038  (  0.0054)
        -------------------------------
             Total unit  1    7.00000  (100.0000)
            Charge unit  1    1.00000
 Ding Xunlei
 2003-11-05
 ______________________________________________
 Ding Xunlei, Ph.D. Candidate
 Open Laboratory of Bond Selective Chemistry
 University of Science & Technology of China
 Hefei, Anhui 230026, P.R.China
 Tel.: 0086-551-3603418
 Fax.: 0086-551-3602969
 E-mail: dxl*at*mail.ustc.edu.cn
 Http://www.bsc.ustc.edu.cn/~dxl
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