title: Fill bars in gnuplot with dots or other patterns
body: <p>I'm drawing some bar charts using gnuplot (histogram). I need different and various patterns to fill the bars. Using "fs pattern XX", I can use some patterns, but they are all some lines.</p>
  
  <p>I need the border to be solid line (linetype 1), and the bar be filled by dots. If I change the linetype of pattern, then the border is changed as well. I want to keep the border solid.</p>
  
  <p>Any idea?</p>