The `candlesticks` style is only relevant for 2-d data plotting of financial
data. Five columns of data are required; in order, these should be the x
coordinate (most likely a date) and the opening, low, high, and closing
prices. The symbol is an open rectangle, centered horizontally at the x
coordinate and limited vertically by the opening and closing prices. A
vertical line segment at the x coordinate extends up from the top of the
rectangle to the high price and another down to the low. The width of the
rectangle may be changed by `set bar` (Note:bar ). The symbol will be
unchanged if the low and high prices are interchanged or if the opening and
closing prices are interchanged. See `set bar` and `financebars`
(Note:financebars ).