# Set square 1000×1000 SVG output and filename
 # The font size (fsize) sets the size for the circles, too.
 set terminal svg enhanced size 1000 1000 fname "Times" fsize 36
 set output "ceiling.svg"

 # Set the text value for missing entries in the data file, so we can plot a [[w:discontinuous function|discontinuous function]]
 set datafile missing "Skip"

 # Set y axis limits so the plot doesn't go right to the edges of the graph
 set yrange [-3.5:3.5]
 # Set x axis limits so the first and last points are hidden
 set xrange [-3.5:3.5]

 # No legend needed
 set nokey

 # Add lightly-colored axis lines
 set yzeroaxis
 set xzeroaxis

 # Plot as lines and also points (circles)
 plot "ceiling.dat" with lines
 plot "ceiling.dat" with points 1 6

 # Close the file (so I don't have to close gnuplot to view it)
 set output

#  X     Y1
   -4    -4
   Skip
   -4    -3
   -3    -3
   Skip
   -3    -2
   -2    -2
   Skip
   -2    -1
   -1    -1
   Skip
   -1    0
   0     0
   Skip
   0     1
   1     1
   Skip
   1     2
   2     2
   Skip
   2     3
   3     3