const char isaac_ghost_version[] = "$Revision: 1.3 $";
const char isaac_ghost_date[]="$Date: 2001/07/31 07:26:34 $";
int  isaac_ghost_main(void * d);

cmdline_spec isaac_ghost_cmd[] = {
    {'f', "force", "Force ghost correction", 0, NULL},
    {0, 0, 0, 0, 0}
};

const char isaac_ghost_man[]=
"\n"
"NAME\n"
"\tghost -- ISAAC electrical ghost correction\n"
"\n"
"SYNOPSIS\n"
"\tisaacp ghost [-f|--force] <list of FITS files...>\n"
"\n"
"DESCRIPTION\n"
"\tis_ghost  applies  simple arithmetic methods to remove the\n"
"\teffects of an electrical ghost in ISAAC raw frames.\n"
"\n"
"\tTo  avoid  applying  the  same  algorithm  several  times,\n"
"\tis_ghost  leaves two keywords in the FITS header: GHOSTREM\n"
"\tshould be equal to 1, it is a  flag  indicating  that  the\n"
"\twork  has  been  done  already  (it  is  called the 'ghost\n"
"\tflag'), and GHOSTVER indicates the date when the algorithm\n"
"\thas been latest modified.\n"
"\n"
"\tIf some files contain the ghost flag but must be processed\n"
"\tanyway, you can force  it  by  using  the  -f  or  --force\n"
"\toption.\n"
"\n"
"\tis_ghost will write all output files in the current direc-\n"
"\ttory only. It means that when you are launching  the  com-\n"
"\tmand  in the current directory, files will be overwritten.\n"
"\tIf you do not want to overwrite your files, cd to  another\n"
"\tdirectory,  and  call  is_ghost  with  the pathname of the\n"
"\tfiles you want to process. See the examples for more info.\n"
"\n"
"ALGORITHM\n"
"\tThe  algorithm  is the following: create a 1d signal which\n"
"\tis for each element the sum of all pixels along a line  of\n"
"\tthe input image. Create another 1d signal that is mirrored\n"
"\tfrom the first, or rather swapped: [1..512][513..1024]  is\n"
"\tcopied  to  [513..1024][1..512]. Add up these two signals,\n"
"\tmultiply by a constant (1.35e-5) and you get a  single  1d\n"
"\tsignal.  Every  element  in this signal is a value that is\n"
"\tsubtracted from all pixels belonging to the  corresponding\n"
"\tline in the input image.  Example: element 384 in the com-\n"
"\tputed 1d signal will be subtracted from all pixels on line\n"
"\t384 in the input image.\n"
"\n"
"OPTIONS\n"
"\t-f or --force\n"
"\t\tForce  deghosting  of  all given files, whether the\n"
"\t\tghost flag is found or not.\n"
"\n"
"EXAMPLES\n"
"\tTo correct for the ghost all files in the  current  direc-\n"
"\ttory matching *.fits, you would type:\n"
"\tis_ghost *.fits\n"
"\n"
"\tTo  correct  for the ghost all files in a remote directory\n"
"\tcalled /cdrom/data/, and create the cleaned  copies  in  a\n"
"\tdirectory called /scratch, you would type:\n"
"\n"
"\tcd /scratch\n"
"\tis_ghost /cdrom/data/*.fits\n"
"\n"
"\n"
"\n";