# NOT RUN {
x = rnorm(1600)
factors = sample(letters[1:16], 1600, replace = TRUE)
circos.initialize(factors = factors, x = x)
circos.trackHist(factors = factors, x = x, col = "#999999",
border = "#999999")
circos.trackHist(factors = factors, x = x, bin.size = 0.1,
col = "#999999", border = "#999999")
circos.trackHist(factors = factors, x = x, draw.density = TRUE,
col = "#999999", border = "#999999")
circos.clear()
# }
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