tsum2(CO2, "uptake", "Type", "Treatment")
tsum2(CO2, "uptake", "Type", "conc")
tsum2(CO2, "uptake", "Type", "Treatment",
e=c("mean", "median", "sd", "min", "max", "length"),
ou=c("chilled", "nonchilled"),
repl=list(c("median", "length"), c("med", "n")))
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