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Preferences
Cell Options
Cell Frame Options
CellFrame
• CellFrame is an option for cells that determines if a frame is drawn around a cell.
• With the setting CellFrame 
k, each side of the frame has a thickness k times the default thickness of a line.
• With the setting CellFrame {{l, r}, {b, t}}, the left, right, bottom, and top sides of the frame can each have a different thickness.
• With the setting CellFrame False, no frame is drawn around the cell.
• The space left between the frame and the cell contents is determined by CellFrameMargins.
• Dingbats go outside the frame.
• See also: Background, CellDingbat, FrameBox, CellFrameColor, CellFrameLabels, CellFrameLabelMargins.
