Shell script for creating GMT plots of station time series 
 from the values extracted from a GLRED prt file or GLOBK bak file by 
 multibase. 
 
 Basic usage : 
 
    sh_base1c3n -f mb*  
 
        -f     :  Files from multibase to be plotted; all begin with mb_ 
 
    or  -F <filename>  where <filename> is a file containing a list of specific mb_ 
                       files (baselines/stations)
  
 Type 'sh_base1c3n -help' to get a full list of options