NAME

       x_list - Extract Cross-Over Information from the Data Base.

SYNOPSIS

       x_list  [  leg1 ] [ leg2 ] [ -dataflags ] [ -Rwest/east/south/north ] [
       -Xxbase ] [ -H ] [ -I ] [ -V ] [ -Ccorrfile ] [ -Zignorefile ]

DESCRIPTION

       x_list will allow the user to extract information  from  the  xx_base.b
       and xx_legs.b files.  Several options can be passed on the command line
       in order to specify which parameters to extract. They are:

       leg1 leg2
              If two legs are specified, the cross-overs they have  in  common
              are  returned.  If one leg is specified, all the external cross-
              overs involving this leg are  returned,  OR  only  its  internal
              cross-overs  if  -I  is  selected. If no legs are given, all the
              external (or internal with -I) cross-overs  are  returned.  This
              program  is  useful  if  one wants to look at, say, gravity COEs
              versus time from port for a particular leg, etc.

       dataflags
              This is a string of any combination of the following:
                      l means list both legnames.
                      t means list time.
                      x means list longitude.
                      y means list latitude.
                      g means list gravity COEs.
                      m means list magnetics COEs.
                      b means list bathymetry COEs.
                      G means list average gravity at cross-over.
                      M means list average magnetic anomaly at cross-over.
                      B means list average bathymetry at cross-over.
                      h means list heading of ship at cross-over.
              The components are written out  in  the  order  they  appear  in
              dataflags.  The  default  output  is -txygmbGMBhl. When internal
              COEs are desired, the time reported is the  elapsed  time  since
              the  ship first occupied the cross-over point. For external COEs
              the time means time from the start of the year in seconds.

       -R     Only return cross-overs inside the specified region west,  east,
              south, and north. [Default is world].

       -X     Indicate alternate xx_base.b file.

       -H     Issue one header record on output.

       -I     Report on internal COEs [Default is external COEs].

       -C     Apply cross-over correction to the data (i.e. reports the cross-
              over value after the best-fitting corrections have been  applied
              to  both  legs). If no corrfile is given, the default correction
              file is assumed.

       -Z     Ignore those legs that appear in the ignorefile.

GMT4.0                            1 Oct 2004             x_list(GMTMANSECTION)