R `bty` Argument: Box Types for Plot Borders

In R graphics, the bty argument controls the type of box drawn around a plot:

• "o" (default) – complete rectangle (all four sides)
• "n" – no box
• "l" – left and bottom only (L-shaped)
• "7" – top and right only
• "c" – top, left, bottom (C-shaped)
• "u" – left, bottom, right (U-shaped)
• "]" – top, right, bottom

Choose based on visual preference or publication requirements.