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Used in the plot axis drawings.
TT.switch(blr.clock = TT.get("blr.clock"), c1 = NA, c2 = NA, c3 = NA, c4 = NA, blr.order = c(1, 3, 2))
c2 = NA, c3 = NA, c4 = NA, blr.order = c(1, 3,
2))