sectors = letters[1:10]
circos.par(cell.padding = c(0, 0, 0, 0), track.margin = c(0, 0))
circos.initialize(sectors, xlim = cbind(rep(0, 10), runif(10, 0.5, 1.5)))
circos.track(ylim = c(0, 1), track.height = mm_h(5))
circos.par(track.margin = c(0, mm_h(2)))
circos.track(ylim = c(0, 1), track.height = cm_h(1))
circos.par(track.margin = c(0, mm_h(5)))
circos.track(ylim = c(0, 1), track.height = inch_h(1))
circos.clear()
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