The financebars style is only relevant for 2D data plotting of financial data. It requires 1 x coordinate (usually a date) and 4 y values (prices).
5 columns:   date  open  low  high  close

An additional (6th) input column may be used to provide variable (per-record) color information (see linecolor and rgbcolor variable).

The symbol is a vertical line segment, located horizontally at the x coordinate and limited vertically by the high and low prices. A horizontal tic on the left marks the opening price and one on the right marks the closing price. The length of these tics may be changed by set errorbars. The symbol will be unchanged if the high and low prices are interchanged. See set errorbars and candlesticks, and also the finance demo.

Copyright 1986 - 1993, 1998, 2004 Thomas Williams, Colin Kelley
Distributed under the gnuplot license (rights to distribute modified versions are withheld).