Hi all,


I am trying to use plot-twf-sess to create the motion plots as specified in the FsFast Tutorial, but I keep getting the error of "cannot find display."  The command was copy-pasted from the FsFast tutorial (https://surfer.nmr.mgh.harvard.edu/fswiki/FsFastTutorialV5.1/FsFastPreProc_freeview?highlight=%28plot\-twf\-sess%29), and Gnuplot works on this computer (CentOS 6.8; GNOME 2.28.2) with the default terminal type set to "wxt".  I've looked at the plot-twf-sess code in an attempt to troubleshoot but do not entirely understand what "display" means here where this error is generated:

which display > /dev/null
if($status) then
  echo "ERROR: cannot find display"
  exit 1;
endif

I've searched the archives but it seems that no one has encountered this problem yet (or at least written about it), so I can't tell if I'm just missing something glaringly obvious.  Thank you for  your time and please let me know if any further information is needed to solve this!