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Difference between the maximum TX and the minimum TN.
etr(tmax, tmin, data_names = NULL, time.scale = YEAR, na.rm = FALSE)
daily maximum temperature, Celsius
daily minimum temperature, Celsius
names of each period of time
month, season or year
logical. Should missing values (including NaN) be removed?
temperature, Celsius
# NOT RUN { data(data_all) etr(tmax=data_all$tx, tmin=data_all$tn) # }
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