Script to calculate and plot baseline scatter (wrms in mm and nrms) vs length from
  a GLRED print file or GLOBK bak file.  Basic usage: 
  Basic usage : 
 
           sh_globk_scatter -f <file>   
 
     -f[ile]      : Input GLRED prt or GLOBK bak file 
 
 
  There are three types of outputs of potential use in evaluating the quality of a 
  survey or series of surveys:
 
   ps1.*  ps2.* :  Graphical postscript files displaying wrms and nrms scatters,
                   respectively, versus baseline length for all baseline combinations
  
   sum.*     com.*                  :  The nrms and wrms values used to create the plots.
   com.*.sort.wrms  com.*.sort.nrms |  sum is ordered by station, as in the input file;
                                       sum is ordered by baseline length, for plotting;
                                       the last two are ordered by rms values and are the 
                                       most useful for identifying the baselines which appear
                                       anomalous in the plots
 
   val.*  VAL.* : The individual values, for baselines and stations, respectively, used 
                  to calculate the rms.  These files allow you to determine the actual day
                  or survey causing the a large nrms.  They are also useful to give detail (date)
                  and residual value) for the time series generated by sh_baseline (see below)
  
   In each of the above * is replaced by the name of the input file.
 
  Additional options : 
 
    -[l]ength   maxlen : Maximum baseline to plot (defines horizontal scale); default is 1400 km. 
 
    -n[umber]  n       : n is the min sites required for computation; default is 2. 
  
    -help              : List extended features for formatting final plots