#  data_columns.inp
#
#  Input to GNUPLOT, causing it to read DATA_COLUMNS.TXT and
#  create two PostScript plots of certain column pairs.
#
#  Plot #1 will show column 1 versus 2, and column 1 versus 4.
#  Plot #2 will show column 1 versus the difference of columns 4 and 2.
#
set term post default
set data style linespoints
set title "Example of plotting columns of data"
set grid
plot 'data_columns.txt' using 1:2, '' using 1:4
plot 'data_columns.txt' using 1:($4-$2)
quit