#+name: uptime
#+begin_src sh
  paste <(echo -e "1\n5\n15") <(uptime|sed 's/^.*average: //;s/,//g'|tr ' ' '\n')
#+end_src

#+RESULTS: uptime
|  1 | 0.02 |
|  5 | 0.06 |
| 15 | 0.05 |

#+begin_src gnuplot :var data=uptime :results silent
  set xrange [0:]
  set yrange [0:]
  set title "uptime"
  set xlabel "minutes ago"
  set ylabel "load"
  plot data w lines
#+end_src