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na.strings=na9()
read.table
na9(nspace = 5, base = c(-9999, -999, -9.99, -9.999), sep = c(",", "."), digits = 0:4, more = NULL, ...)
paste
na9() na9(nspace=0, sep=".") na9(nspace=0, sep=".", more=c(NA,"-"))
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