title: reduce empty spaces in the plot and make the graph fit optimally
body: <p>I am plotting multiplot with 11 graphs. I given the code used below:</p>
  
  <pre><code>#!/usr/bin/gnuplot
  
  ########################################################################################
  #OUTPUT
  
  set size 1.0, 1.0
  
  #POSTCRIPT
  set term postscript landscape enhanced color 
  set output "radial_distribution_function.ps"    #
  
  #set terminal postscript portrait enhanced color dashed "Helvetica" 8 
  #set output "time-density-profile-maltose.ps"
  
  #PNG
  #set terminal pngcairo size 650,450 enhanced dash
  #set output "multi-plot_gauche_bcMalto-chain2-thermo.png"
  
  # WXT
  #set terminal wxt size 900,450 enhanced font 'Arial,10' dashed persist
  
  
  #set style line 4 lt 4 lw 10    # Please DISABLE pause -1 
  #########################################################################
  set style line 1 lt 1 lc rgb "#FFB6C1"  lw 2.0  
  set style line 2 lt 1 lc rgb "black"    lw 2.0 
  set style line 3 lt 1 lc rgb "green"    lw 2.0 
  set style line 4 lt 1 lc rgb "blue"     lw 2.0 
  set style line 5 lt 1 lc rgb "#8B008B"  lw 2.0
  set style line 6 lt 1 lc rgb "yellow"   lw 2.0
  #########################################################################
  
  
  ### START MARCRO
  set macro
  #ylabelFONT="font 'Arial,16'"
  labelFONT="font 'Arial,12'"
  scaleFONT="font 'Arial,12'"
  keyFONT="font 'Arial,14'"
  #graph="using 1:2 with lines lw 1   "
  scaleFONT2="font 'Arial,11'"
  ### END MACRO
  
  
  set key font ",8"
  set key spacing 0.7
  unset key
  set autoscale                           # scale axes automatically
  set xtic auto                        @scaleFONT     # set xtics automatically
  set ytic auto                        @scaleFONT     # set ytics automatically
  set xlabel "Distance (Angstrom)"    @labelFONT
  set ylabel "g(r)"           @labelFONT
  set xrange [0:10]
  set yrange [0:5]
  #set title "Density profile for isomaltose"
  
  
  set multiplot layout 4,3 title ""
  
  
  # PLOT_1
  set label "(a) O11" at 1.5, 4   @labelFONT
  plot    "maltoLyo12per-ddm_O11-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O11-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O11-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O11-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O11-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O11-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  
  # PLOT_2
  unset label
  set label "(b) O12" at 1.5, 4   @labelFONT
  plot    "maltoLyo12per-ddm_O12-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O12-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O12-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O12-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O12-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O12-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  # PLOT_3
  unset label
  set label "(c) O13" at 1.5, 4   @labelFONT 
  plot    "maltoLyo12per-ddm_O13-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O13-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O13-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O13-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O13-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O13-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  # PLOT_4
  unset label
  set label "(d) O14" at 1.5, 4   @labelFONT
  plot    "maltoLyo12per-ddm_O14-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O14-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O14-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O14-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O14-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O14-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  
  
  # PLOT_5
  unset label
  set label "(e) O15" at 1.5, 4   @labelFONT 
  plot    "maltoLyo12per-ddm_O15-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O15-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O15-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O15-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O15-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O15-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  # PLOT_6
  unset label
  set label "(f) O16" at 1.5, 4   @labelFONT
  plot    "maltoLyo12per-ddm_O16-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O16-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O16-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O16-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O16-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O16-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  
  
  # PLOT_7
  unset label
  set label "(g) O22" at 1.5, 4   @labelFONT 
  plot    "maltoLyo12per-ddm_O22-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O22-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O22-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O22-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O22-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O22-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  # PLOT_8
  unset label
  set label "(h) O23" at 1.5, 4   @labelFONT
  plot    "maltoLyo12per-ddm_O23-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O23-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O23-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O23-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O23-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O23-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  
  
  # PLOT_9
  unset label
  set label "(i) O24" at 1.5, 4   @labelFONT 
  plot    "maltoLyo12per-ddm_O24-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O24-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O24-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O24-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O24-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O24-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  # PLOT_10
  unset label
  set label "(j) O25" at 1.5, 4   @labelFONT
  plot    "maltoLyo12per-ddm_O25-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O25-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O25-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O25-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O25-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O25-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  
  
  # PLOT_11
  unset label
  set label "(k) O26" at 1.5, 4   @labelFONT
  unset key 
  plot    "maltoLyo12per-ddm_O26-wat_O.dat"   using 1:2 w l ls 1 title "{/Symbol b}Mal-C_{12}12%H_{2}O",\
      "maltoLyo23per-ddm_O26-wat_O.dat"   using 1:2 w l ls 2 title "{/Symbol b}Mal-C_{12}23%H_{2}O",\
      "bcmLyo25perR-BMR_O26-wat_O.dat"    using 1:2 w l ls 3 title "{/Symbol b}Mal-C_{12}C_{8}(R)25%H_{2}O",\
      "bcmLyo25perS-BCS_O26-wat_O.dat"    using 1:2 w l ls 4 title "{/Symbol b}Mal-C_{12}C_{8}(S)25%H_{2}O",\
      "bchainRS25per-BMR_O26-wat_O.dat"   using 1:2 w l ls 5 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(R)25%H_{2}O",\
      "bchainRS25per-BMS_O26-wat_O.dat"   using 1:2 w l ls 6 title "{/Symbol b}Mal-C_{12}C_{8}(RS)(S)25%H_{2}O"
  
  unset multiplot
  </code></pre>
  
  <p>The graph that I get is show here <img src="https://i.stack.imgur.com/qZDiX.png" alt="enter image description here"> </p>
  
  <p>What I notice from the graph is there is lot of empty space between the graphs. For example between graph (a) and (b) and also between graph (a) and (d). I want to reduce the space between them and make the graph little bigger. </p>
  
  <p>What I should do to reduce the space and optimize the graph size.</p>
  
  <p>Thanks in advance.</p>