This shell script is an example on how to prepare parameterized graphics using "jog".  The flexibility of shell scripting enables to retrieve data from various calculation output files (with awk)  and combine them into a figure using a fairly clear source file.

#! /bin/bash

# lsq output file with improved parameters
prm="lsq.log"

# lsq output file table : 2theta  observed  calculated
dat="lsq.xy"
out="lsq.jog"

# plot style for observed and calculated data
exp="2 Size NoLines Empty Circles"
cal="Lines"

# setup x and y scales
xmin="0"
xmax="50"
ymin="-500"
ymax="21000"

# top of table in points
h0="230"

# absolute x position of each column of table
x1="280"
x2="290"
x3="320"
x4="380"
x5="390"
x6="440"

# place legend of graph elements
xleg="110"
yleg="230"
#font="(Times-RomanF) 12 Font"
font="(HelveticaF) 12 Font"

# overwrite default by command line assignments
# to change on the fly plot styles or layout
for arg; do eval $arg; done

echo "
gsave
$font
[50 500 50 250] [$xmin $xmax $ymin $ymax] Axe2

[ (5) (10) (15) (20) (25) (30)] GradX
% [(0)(500)(1000)] GradY
(2\`q) GradX
% (a.u.) GradY

$exp
[
$( cat lsq.xy | awk ' { printf("%s\t%s\n",$1,$2) } ' )
] Plot

$cal
[
$(
  # trim data below maxy
  cat lsq.xy | awk -v ymax="$ymax" '$3<ymax { printf("%s\t%s\n",$1,$3) }'
)
] Plot
grestore

gsave
% jog's nasty bug use only once in a gsave grestore bracket
% TODO fix this !
10 Font

$xleg $yleg
($exp) ( Experimental) Label
($cal) ( Calculated) Label

$x1 $h0
$(head -n 51 $prm | awk ' NF==2 { if ($2==0) {print "()"} else {print "(*)"} }' | head -n 9 )
Wrt

$x2 $h0
(W_B) (W_C) (P_B_B)(P_B_C)(P_C_B)(P_C_C) (d_A) (d_B) (d_C) Wrt

$x3 $h0
$(head -n 51 $prm | awk ' NF==2 {printf("(%6.4f)\n",$1)}' | head -n 9)
Wrt

$x4 $h0
$(head -n 51 $prm | awk ' NF==2 { if ($2==0) {print "()"} else {print "(*)"} }' | tail -n 10 )
Wrt

$x5 $h0
(Sig. A)(Sig. B)(Sig. C)(Avg. n)(Sigma*)(Scale)(Div. Slit)(Soller 1)(Soller 2)(Sample L.)
Wrt

$x6 $h0
$(head -n 51 $prm | awk ' NF==2 {printf("(%6.4f)\n",$1)}' | tail -n 10)
Wrt
grestore
" > $out
ge $out