" ----------------------------------- ACDFWI ---------------------------------",
  " ",
  " Acoustic constant density full waveform inversion",
  " iwave/acd/main/acdfwd.cc",  " 
" ",
  " ------------------------- begin acdfwi parameters -------------------------",
  " ",
  "      init_csq = <path>      path to initial csq file (may be same as csq",
  "                             in acd parameters)",
  "     final_csq = <path>      path to final csq file",
  "       datamut = ""          path to muted data file - optional",
  "       dataest = ""          data estimated from final model",
  "       datares = ""          data residual from final model",
  "       outfile = ""          verbose output - default is terminal",
  "     OptMethod = lbfgs       optimization method - current choices are "
  "                             lbfgs (default) and trcg",
  "
  " --------------------------- end acdfwi parameters -------------------------",
  " NOTE: data path same as data parameter for acd",