# NOT RUN {
pdf(NULL)
circos.initialize("a", xlim = c(0, 1))
circos.track(ylim = c(0, 1), panel.fun = function(x, y) {
print(CELL_META$sector.index)
print(CELL_META$xlim)
})
print(names(CELL_META))
dev.off()
# }
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