op = par(no.readonly = TRUE)
sectors = letters[1:8]
circos.par(points.overflow.warning = FALSE)
circos.par(gap.degree = 8)
circos.initialize(sectors, xlim = c(0, 10))
circos.trackPlotRegion(sectors, ylim = c(0, 10), track.height = 0.5)
par(cex = 0.8)
for(a in letters[2:4]) {
circos.yaxis(side = "left", sector.index = a)
}
for(a in letters[5:7]) {
circos.yaxis(side = "right", sector.index = a)
}
circos.clear()
par(op)
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