FIXED FORMAT HEADER

If a 'fixed-format' header is used, there is a single primary input
file (though additional TOAs and commands may be incorporated via the
INCLUDE command; see TOA COMMANDS).  The first line of the file contains a
series of one-character flags indicating which model parameters should
be fit, and controlling characteristics of the fit.  Flag locations
within the first line are listed under 'Header Flag Column' below.
Parameter values themselves are contained on subsequent lines:

Header  --Parameter--
 Flag   ----Value----
Column  Line  Columns    Parameter
  1                      RPHASE
         2     1-12      PSRNAME
  5           21-40      RA***
  6           41-60      DEC***
  7           61-70      PMRA
  8           71-80      PMDEC
  2      3     2-20      P0
  3           21-40      P1
              41-60      PEPOCH
  4           61-70      P2
  17          71-80      PX
  16     4     9-20      DM
  9      5*    1-20      A1
  10          21-40      ECC
  11          41-60      T0
  12          61-80      PB****
  13     6*    1-10      OM
  14          11-20      OMDOT   [nbin!=4]    XOMDOT [nbin==4]
  15          21-30      GAMMA
  18          31-40      PBDOT   [nbin!=4]    XPBDOT [nbin==4]
  20          41-50      SINI
  21          51-60      MTOT
  22          61-65      M2      [nbin!=7]
              66-70      DR      [nbin!=7]
  23          71-74      DTHETA  [nbin!=7]
              75-78      A0      [nbin!=7]
              79-80      B0      [nbin!=7]
  19          61-70      M1      [nbin==7]
  24          71-75      BP      [nbin==7]
  25          76-80      BPP     [nbin==7]
              
         **    1-5       Flags for GLPH, GLF0P, GLG1P, GLG0D, GLDT
         **   11-22      Glitch epoch
         **   23-34      Glitch phase increment
         **   35-46      Permanent glitch pulse frequency increment
         **   47-58      Permanent glitch frequency derivative
         **   59-70      Decaying glitch frequency increment (s^-1)
         **   71-82      Decaying glitch time constant (days)
    
Notes:
   *  Lines 5 and 6 contain parameters for the first orbital 
      companion.  Parameters for two additional orbital companions 
      may be listed on lines 7-8 and 9-10.  These orbits are may only 
      have Keplerian parameters (all columns of first line, columns 1-10 
      or second line).  Flags are in columns 51-55 and 56-60.

  **  Lines containing glitch parameters start immediately after the 
      lines for pulsar and binary parameters. 

 ***  RA and DEC have form hhmmss.ss and ddmmss.ss

****  PB is in seconds, not days (as in free-format headers)

Several control flags are also set in the first line:

Header
 Flag
Column  Line       Notes
  27    NBIN     Binary model: 0=none 1=BT 2=EH 3=DD 4=DDGR 5=H88
                  6=BT+ 7=DDT 8=DD+ 9=2 BT orbits a=3 BT orbits
  29    NPRNT    List residuals every 10^NPRNT lines
  33    ITERS    Number of iterations
  40    NGL      Number of glitches
  42    NDDM     Use DM corrections if NDDM=1
  44    NCLK     0=observatory clock, 1=UTC(NIST), 2=UTC, 3=TT(BIPM), 
                  4=UT(PTB), 5=AT1
  46    EPHEM    Ephemeris number  (must be 1 for DE200;  formerly 0 for
                   PEP740R was also allwed)
  47    COORDS   Input coordinates (0=B1950, 1=J2000)