"The dataset has been completely made up, and instead of using a
column from the dataset as the x-axis values, the labels have been
explicitly supplied for each row in the first column. The extra
:xtic(1) column specification in the first using clause tells
gnuplot what to use for the x-axis tic labels. Because of the
"<" at the start of the file name, the data is taken from the
standard output of the sqlite3 command which issues the query to
the database. Note that the second using clause is specified as the
empty string so the same query is used for both using clauses. The
downside of taking the data from a sub-command like this is that
the command is executed for each using clause, in this case causing
the query to be run twice. The gain is that it is a fairly quick
and dirty way to get the data if the query is simple."
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