variables <-
c("d15N (uncalibrated)" = "d15.raw",
"d18O (uncalibrated)" = "d18.raw",
"Area All" = "area",
"d45 (raw)" = "d45",
"d45 (drift-corrected)" = "d45.drift",
"d46 (raw)" = "d46",
"d46 (drift-corrected)" = "d46.drift")
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