anchor.diff:  ,,,,,,
   "Total",,,1.000000,1.000000,0.112787,
   ,,,,,,
  -"MCNP Form","Mass Fractions",,"Atom Fractions",,"Atom Densities",
  +"MCNP Form","Weight Fractions",,"Atom Fractions",,"Atom Densities",
   "Neutrons",1001,-0.160000,1001,0.694164,1001,0.078293
   ,6000,-0.840000,6000,0.305836,6000,0.034494
   ,,,,,,
  
positive.code: ,,,,,,
  ,,,,,,
  "215.  ","Oil, Fuel (Calif.)",,,,,
  "Formula =","-",,"Molecular mass (g/mole) =","Molecular mass (g/mole) =",,"-"
  "Density (g/cm3) =",,0.955000,"Total atom density (atoms/b-cm) =",,,1.133E-01
  "The above density is estimated to be accurate to 2 significant digits.  Dealing with uncertainties is left to the user.",,,,,,
  "The following data was calculated from the input mass fractions.",,,,,,
  ,,,,,,
  ,,,"Mass","Atom","Atom",
  "Element","Neutron ZA","Photon ZA","Fraction","Fraction","Density",
  "H",1001,1000,0.125878,0.633782,0.071824,
  "C",6000,6000,0.862308,0.364349,0.041290,
  
negative.code: ,,,,,,
  "Total",,,1.000000,1.000000,0.066473,
  ,,,,,,
  "MCNP Form","Weight Fractions",,"Atom Fractions",,"Atom Densities",
  "Neutrons","-",-0.100000,"-",0.217879,"-",0.014483
  ,11023,-0.005000,11023,0.005123,11023,0.000341
  ,13027,-0.879000,13027,0.767366,13027,0.051009
  