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Set for multi-column output. The frame is split into 'number' columns, and text is drawn line by line in the current column, moving to the next one when it fills up. If the keyword BOX is specified, a box is drawn around each column and around the entire plot frame. The default is single column output. When this command is given, any open plot frame is closed. The GRID command can be used to obtain similar boxing without text being drawn in multiple columns.