diff --git a/RBBGCMuso/R/calibration.R b/RBBGCMuso/R/calibration.R
new file mode 100644
index 0000000..23edf8e
--- /dev/null
+++ b/RBBGCMuso/R/calibration.R
@@ -0,0 +1,2 @@
+GPP_mes <- read.csv("hhs_GPP_measured.csv", stringAsFactors)
+head(GPP_mes$year)