synspec:

 Atomic lines:

   Starting with the DR16 (20180901) linelists, Dmitry ran his program
   to adjust log(gf) and damping parameters, using a Synspec synthesis
   for the Sun and Arcturus, which yielded slightly different results
   than those from a Turbospectrum synthesis.

   For the Turbospectrum 20 list, Verne concluded that region with CuI and TiII
   lines was improperly handled by the line adjustment program (perhaps because
   of a telluric feature). The lines in this region were adjusted by Verne
   for the Turbospectrum 20 synthesis, but this was not done for the 
   Synspec synthesis, which means that Cu in Synspec is not reliable.

   APOGEE master:
      linelist.20200921nlte.txt has 51227 lines
   Synspec format :
      synspec.20200921nlte.atoms has 51261 lines = 51227 + 34 lines added longward of 1700 for synple interpolation issues
      atoms linelist format:
       write(*,512)WL,CODE,GFLOG,E,XJ,EP,XJP,GAMMAR,GAMMAS,GAMMAW,INEXT,s1,l1,p1,s,l,p
       512    FORMAT(F11.4,F7.2,F8.3,F12.3,F6.1,F12.3,F6.1,1X,A6,1X,A6,1X,A6,I2,6(I3))

       1-11    F11.4     WL in nm
       12-18   F7.2      Code for the species and ionization where the integer is the atomic number and decimal the ionization
       19-26   F8.3      log gf value which includes the isotope correction
       27-38   F12.3     energy of the lower level in cm-1
       39-44   F6.1      J value for lower level
       45-56   F12.3     energy of the upper level in cm-1
       57-62   F6.1      J value for upper level
       63      1X        skipped line
       64-69   A6        GAMMAR damping
       70      1X        skipped line
       71-76   A6        GAMMAS damping
       77      1X        skipped line
       78-83   A6        GAMMAW damping
       84-85   I2        INEXT    a value always set to 0
       86-88   I3        s quantum number value for lower level from 2nd to last character in label
       89-91   I3        l quantum number value for lower level from last character S,P,D,F,G,H,I,K,L,M,N,O,Q,R,T,U,V,W in label
       92-94   I3        p quantum number value for lower level from 3rd to last character in label
       95-97   I3        s quantum number value for upper level from 2nd to last character in label
       98-100  I3        l quantum number value for upper level from last character S,P,D,F,G,H,I,K,L,M,N,O,Q,R,T,U,V,W in label
       101-103 I3        p quantum number value for upper level from 3rd to last character in label

  Molecular lines:
    taken from IAC Synspec linelist
    Synspec does not include isotope identification in linelist: builds in isotope ratios in linelist through adjusting log(gf) values, so there are two separate files
    synspec.20200921nltegiant.molec : "giant" isotope ratios
          cratio=[[12,0.875],[13,0.125]],nratio=[[14,0.99632],[15,0.00368]],oratio=[[16,0.99906754],[17,0.00033061],[18,0.00060184]]
    synspec.20200921nltesun.molec : solar isotope ratios
          cratio=[[12,0.9889d],[13,0.0111d]],nratio=[[14,0.99632d],[15,0.00368d]],oratio=[[16,0.99757d],[17,0.00038d],[18,0.00205d]]

    linelists contain :
      OH: 2551
      FeH :2782
      C2 : 4217
      CN : 9817 
      CO : 29752 
      Total : 49119

    Thomas Masseron compilation: synspecmolec.20180624f.strip.noh2o has 58904 lines :
      OH : 11776  (2550 16OH + 4254 17OH + 4702 18OH)
      FeH : 2782
      C2 :  4783   (4783 12C12C)
      CN :  9815   (5591 12C14N + 4224 13C14N)
      CO : 29748  (7478 12C16O + 7411 13C16O + 7458 12C17O + 7401 12C18O)
      Total : 58904
    so, for DR17, our list differs from Thomas' by:
      - we dropped 17OH and 18OH 
      - duplicated one 16OH line  (1749.784)
      - dropped some C2 lines
      - duplicated two CN lines  (1749.811 and 1749.936)
      - duplicated four CO lines (1749.969, 1749.989, 1749.990, 1749.996)

    molecules format:
      WRITE(*, '(F10.4,F10.2,F7.3,F12.3,E10.2,E10.2,E10.2)') WL,float(CODE),GFLOG,abs(E),GAMMAR,GAMMAS,GAMMAW
      1-10    F10.4      WL in nm
      11-20   F20.2      Code for the species where the integers are the atomic number separated by 0.
      21-27   F7.3       log gf value which includes the isotope correction
      28-39   F12.3      energy of the lower level in cm-1
      40-49   F10.2      GAMMAR damping
      50-59   F10.2      GAMMAS damping
      60-69   F10.2      GAMMAW damping