circos.initialize(letters[1:8], xlim = c(0, 1))
circos.track(ylim = c(0, 1), track.height = 0.3, panel.fun = function(x, y) {
x = seq(0.2, 0.8, by = 0.2)
y = seq(0.2, 0.8, by = 0.2)
circos.segments(x, 0.1, x, 0.9)
circos.segments(0.1, y, 0.9, y)
})
circos.clear()
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