NPM2 Cross-Index Catalog:  Class (KLA) Code Translation (164 types)
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    1. Non-Variable (mainly) Goups (56 classes).    
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    Spectral type/range   O   OB  OBA B   BE  BAE BP  AP  AK  F   FG 
                          DKM GM  N   S   S:  SMS 
 
    Other classes         BAR CAR CH  COM CPM DWF ELS GNT HAE HB  HDS
                          HH  HPM HVS H2O IR  LUM MDS MLS MSC PEC PNB 
                          RED SD  SYM UVB UVE WD  WR  XR  YSO

    Photometry (UBV)      UBV BV 

    Mixed (star/galaxy)   RAD = Radio source. 
                          FBO = Faint blue object.
                          FBS = Faint blue star.

    Extragalactic         CG  = Compact galaxy.
                          GAL = Galaxy.
                          QSO = Quasar.

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    2. Variable Star Types (95 classes)
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    All variable star designations used in NPM2 Cross-Index Catalog are 
    listed here.  This includes the uncertainty symbol '':'' for the user 
    seeking full list of a specific class.

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     Name              Class (KLA) 
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     Alpha CVn         ACV
     Alpha Cyg         ACY 
     Beta Cep          BCE
     BY Dra            BY  BY:
     Cataclysmic var.  CV
     Cepheid           CEP CD  CW  CWA CWB
     Constant          CST
     Delta Cep         DCE 
     Delta Scu         DSC
     Dwarf nova        DN
     Eclipsing         E   E:  EA  EA: EB  EB: ELL EW  EW: E/C E/I
     Gamma Cas         GCA 
     Irregular         I   I:  IA  IB  IB: IN  IN: INA INB INS INT IS  
                       IS: ISA ISB IT: S/I
     Slow Irregular    L   L:  LB  LB: LC 
     Mira              M   M:
     Nova              NOV NL  NA  NB  NC 
     (Orion var)       ORI
     PV Tel            PVT
     Close binary      R
     R CrB             RCB 
     RR Lyr            RR  RR: RRA RRC RRS 
     RS CVn            RS 
     RV Tau            RV  RV: RVA RVB 
     (short period)    SP 
     Semi-regular      SR  SR: SRA SRB SRC SRD
     SX Phe            SXP 
     T Tauri           TAU
     U Gem             UG  UG:
     Unique (=*)       UNI 
     Unknown (=?)      UNK
     UV Cet            UV  UV: UVN
     Variable star     VAR
     X-ray source      XM  XP
     Z And             ZAN 
     Z Cam             ZCA
     ZZ Cet            ZZ  ZZA ZZB ZZC 
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     Note: Variable stars in the ICSS were taken initially from the GCVS2 
     (1968) and later Name Lists as they became available during the 
     second-epoch phase of the NPM program starting 1970's.  The parts
     included in ICSS are now almost equivalent to GCVS4, except for some
     updated corrections for individual stars. 

       Kukarkin et al. (ref0001)
       Kholopov et al. (ref0614, ref0615, ref0616)
       Kazarovets & Samus (ref0972)
       Kazarovets et al. (ref0973)
       Kazarovets & Samus (ref1003)
       Post-Name List stars added in forming GCVS3 (ref0971)
    
     Details for variable star types: N.N. Samus, & O.V Durlevich 2004 
     (Sternberg Astron. Inst., Moscow). 
          www.sai.msu.su/groups/cluster/gcvs/gcvs/

    3. Star Lists and Fields (13 classes)
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    Several large catalogs and star lists, but not all, were given a class 
    code KLA in ICSS.  Other catalogs and lists reside in NPM2 Cross-Index
    Catalog simply by their ''ref'' number and specific class of star.  The  
    user should consult the files listing publications, either npm2ref1.dat
    (arranged by increasing ''ref'' number) or npm2ref2.dat (alphabetically 
    by first author).

    Catalogs/Lists     CMC = Carlsberg Meridian Circle Catalogues (ref0817)   
                       CNS = Catalogue of Nearby Stars #3 (ref0810)
                       CSV = Catalogue of Suspected Variables (ref0816)
                       DCL = Dark clouds: Bok 227 and Lynds 121 (ref0748)
  
                       EUV = Extreme Ultraviolet Sources (ref0732, etc)
                       IRA = IRAS infrared sources (ref1063, etc)
                       LK  = Lick discovery (3 stars, ref0637)
                       LNK = Hipparchos Link Stars (Argue list, ref0578)
                       PPN = Pre-planetary nebula (ref1088. ref1011)
                       YPC = Yale Parallax Catalog #3 (ref0809)

    Star fields        ASS = Stellar association Cep OB3 (ref1015)  
                       HYA = Hyades astrometry (Hanson, ref1005)
                       RNB = Reflection nebula (ref0967)
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