15.66.1  Options 

     1.  APPEND   -   Puts   the  smoothed  data  into  a  new  data  set.
         (Default:OFF)
     2.  AVERAGE  -  Modifies  FLAT.  When average=off each channel is the
         sum of n adjacent channels.
         (Default:ON)
     3.  CHECK - Checks the data to see if it is a proper histogram with X
         or X/Y for mesh equally spaced.  IF it is not an error message is
         issued,and no smoothing is done.
         (Default:ON)
     4.  ERROR  -  Modifies  the  errors  on the data assuming statistical
         errors.  If OFF the errors are  not  modified.   Essentially  the
         smoothing algorithm is used on the square of the errors.
         (Default:ERROR=ON for REVISION>4.99)
     5.  FLAT  - Smooths the data by adding together and averaging every n
         points.  The  result  has  every  n  points  identical.   LEVEL=n
         selects  the  number  of points.  For example SMOOTH FLAT LEVEL=2
         averages points 1+2, 3+4, 5+6...
         (Default:OFF)
     6.  LEVEL=n  -  Selects  approximately the number of points on either
         side of the bin that are used in determining the value  for  that
         bin.   The  range  of  levels  is  1  to 5.  1 Will smooth over 3
         points, while 5 will smooth over 11 points.
         (Default:3)
     7.  LINES/ROWS - Selects which rows of a mesh are smoothed.
     8.  LIMITED - Selects the range of X,Y,Z values to smooth.
     9.  LOG - Logs or types the results on your terminal.
    10.  MONITOR - Histograms the original data and joins the result.
         See:  SET MODE MONITOR
         The  result  is joined using the SECONDARY attributes.  to change
         them use the SET SECONDARY command.

    11.  NAME - Selects the name of the appended data set 
    12.  POINTS/COLUMNS  -  Selects which data points or columns of a mesh
         are smoothed.  If omitted all are smoothed.
    13.  SELECT - Selects the data set by name
    14.  SETS - Selects which data sets to use.
    15.  X,Y,Z...   selects  whether  X, Y, or Z values are replaced.  For
         MESH data it selects the axis to smooth along.  (Default:Y)