wldf1 <- WaterLevelDataFrame(river = "Elbe",
time = as.POSIXct("2016-12-21"),
station = seq(257, 262, 0.1))
wldf2 <- WaterLevelDataFrame(river = "Elbe",
time = as.POSIXct("2016-12-21"),
station = seq(262, 270, 0.1))
wldf <- rbind(wldf1, wldf2)
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