Nothing
require("tframePlus")
z <- ts(1:10, start=c(1999,2), freq=12)
seriesNames(z) <- "ser 1"
ok <- TSwriteXLS(z, FileName="test.xls")
zz <- tbind(z, diff(z))
seriesNames(zz) <- c("ser 1", "diff")
ok <- TSwriteXLS(zz, FileName="test.xls", SheetNames="2 series")
zz <- ts(1:10, start=c(1999,1), freq=1)
seriesNames(zz) <- "annual ser"
ok <- TSwriteXLS(z, zz, FileName="test.xls", SheetNames=c("monthly", "annual"))
unlink("test.xls")
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