circos.initializeWithIdeogram(chromosome.index = paste0("chr", 1:4), plotType = NULL)
circos.track(ylim = c(0, 1), panel.fun = function(x, y) circos.genomicAxis())
circos.track(ylim = c(0, 1), track.height = 0.1)
circos.track(track.index = get.current.track.index(), panel.fun = function(x, y) {
circos.genomicAxis(h = "bottom", direction = "inside")
})
circos.clear()
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