title: Plot lines and vector in graphical gnuplot
body: <p>Hello everyone does anyone have any idea how to do this type of graph.</p>
  
  <p>I tried to plot the combination of lines and points but it still fails.</p>
  
  <p>I think I have put a range to plot point to get the example I below.</p>
  
  <p>dat.txt</p>
  
  <pre><code>0.936   1.735E-5
  0.9317  1.682E-5
  0.9274  1.633E-5
  0.9232  1.588E-5
  0.9189  1.545E-5
  0.9146  1.504E-5
  0.9103  1.466E-5
  0.9061  1.431E-5
  0.9018  1.396E-5
  0.8975  1.364E-5
  0.8932  1.333E-5
  0.889   1.304E-5
  0.8847  1.277E-5
  </code></pre>
  
  <p>For Plot </p>
  
  <pre><code>set xl 'Potential / V'
  set yl 'Current / A'
  plot 'dat.txt' u 1:2 w l lw 2 lt -1,\
  'dat.txt' u 1:2 w p pt 2 ti ''
  </code></pre>
  
  <p>example of how it should be plotted</p>
  
  <p><img src="https://i.stack.imgur.com/y6iFU.png" alt="Graphical"></p>