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    CHA[38]=""
    CHA[39]=""
    CHA[40]=""
    CHA[41]=""
    CHA[42]=""
    CHA[43]=""
    CHA[44]=""
    CHA[45]=""
    CHA[46]=""
    CHA[47]=""
    CHA[48]=""
    CHA[49]=""
    CHA[50]=""

    CMN="0"				# Column number for CHA data.

#
# SET DEFAULT OPTIONS:
#

    OPT_E="-E"				# -E use embedded options
    OPT_L="-L"				# -L set logscale axis
    OPT_L_xaxis="x"			# -L set logscale x axis
    OPT_L_yaxis="y"			# -L set logscale y axis
    OPT_H="-H"				# -H default column headings.


# M A I N:   MAIN PROGRAM:
# 
# - Begin main script, functions first.

{

FUNCTION__getopt()			# Use function getopt.
{
# PARSE THE COMMAND LINE FOR OPTIONS, USING GETOPT:
#
# - define USAGE message.
# - use getopts.
# Note:  FUNCTION__getopt is run twice, in order to support:
#        FUNCTION_TITLE_COLHEAD()	# Set Column headings from file.

    ${v}echo "${C}.${0}:  beginning at `date`"	# beginning of function

    USAGE="${C} [ -E -G -H -I -M -S -V -i -l -m -q -r -u -v ]
	[ -C GNU_CMDFILE ]
	[ -D LP_DEV ]
	[ -L axis ]
	[ -N not option ] (turn off option), Example:  -NL
	[ -P GNU_PSFILE ]
	[ -c COLUMN_NUMBER ]
	[ -d differential_type ]
	[ -g GNU_GEOMETRY ]
	[ -o LP_OPT ]
	[ -x xRANGE ]
	[ -y yRANGE ]

    ${C}:  wrapper for gnuplot

    -c plot column number.  This is useful to plot by column number.
    -i plot insert; default if no other plots selected.      CMN=2
    -r plot retrievals; default if no other plots selected.  CMN=4
    -I plot memory used / index.                             CMN=12
    -m plot memory malloced.                                 CMN=9
    -M plot memory used and free.                            CMN=8
    -l plot leaf data.                                       CMN=11
    -d plot derivative data.  Useful with -i, -r, -m.  CMN=2,4,9

    -x xRANGE, scale range;  example:  -x [1000:5000] or -x1000:5000
    -y yRANGE, scale range;  example:  -y [1M:10M]    or -y1M:10M
	 1[kK] = 1,000; 1[mM] = 1,000,000; 1[gG] = 1,000,000,000.

    -n number plot descriptions; Use column numbers before the description.
    -L set logscale axis; default,
	Example:  Turn off logscale with -NL, then turn on, on only one axis:
	  \"-NL -Lx\" or \"-NL -Ly\", Turn off both with -NL
    -G grid lines on.
    -H default column headings.
    -g geometry description.
	 default=\"${GNU_GEOMETRY_DEF}\", # 4x3 aspect ratio.

    -E use embedded options, default, Turn off with -NE. 
      Sets TITLE, COLHEAD, GETOPT from the FIRST data file encountered.
      Example:  embedded options in the data file begin in column 1:
      # TITLE This is the title to pass to gnuplot
      # COLHEAD 1 This is the heading for column 1.
      # XLABEL This is the x-axis label
      # YLABEL This is the y-axis label
      # GETOPT -c2 -c3 -G	# These are the options to use.

    -p print the plot.
    -o LP_OPT printer option(s);  default \"${LP_OPT_DEF}\".
	 Example:  \"-ootray2\" will print on clear slides, emits \"-otray2\"
	 Example:  \"-on2\" will print two copies, emits \"-n2\"
    -D LP_DEV printer device;  default \"${LP_DEV_DEF}\".

    -C GNU_CMDFILE name;  default is generated and removed: 
         ${OUTPUT_DIR}/{DATE_TIME}.GNU_CMDFILE
	 Useful to do your own gnuplot command editing and debugging.
    -P GNU_PSFILE name.  default is generated and removed:
         ${OUTPUT_DIR}/{DATE_TIME}.GNU_PSFILE
    -S Save files.
	 Generated and working file names are deleted unless -S or -C is on.
	 User provided file names are not deleted in any case (-C, -P).

    -q quiet mode, verbose mode off;  default.
    -v verbose mode on.

    -V vi the plot file.
       quit using \"q\"

    -N not option;  Turn specified option off.  Example:  -NL
         Note, -N is not available for all options.
    -NL Turn off:  -L set logscale axis; default
    -NH Turn off:  -H default column headings.

    -u Usage message.

    Sample usage:
    ${C} -i  -f data/datafile	# -i is the same as -c1.
    ${C} -c1 -f data/datafile	# -i is the same as -c1.