NAME

     X_SETUP - Determine  Pairs  of  Legs  that  need  Cross-Over
     Checking


SYNOPSIS

     x_setup [ -Llegfile ] [ -Rwest/east/south/north ]


DESCRIPTION

     x_setup scans the gmtindex.b file that contains  information
     on  which legs occupy each 1 by 1 degree bin and reports all
     the pairs of legs  that  may  overlap.  Each  pair  is  only
     reported  once,  even  if the two legs involved are found in
     other bins also.

     -L   Only report pairs where at least one of  the  legs  are
          present in the legfile.

     -R   The region of interrest.  [Default is world]


     The -L option is useful when one wants to check out a  hand-
     ful  of  new cruises. Obviously we only need to compute COEs
     for the pairs that involve one or two of  the  new  cruises,
     since all the other combinations have already been done.