data frame of dimensions 27 by 4.
assimilation as measured in Beale, Bint and Long (1996) in
Miscanthus. The first column is the observed net
assimilation rate (\mu mol m^{-2}
s^{-1}). The second column is the observed quantum
flux (\mu mol m^{-2} s^{-1}). The third
column is the temperature (Celsius).Relative humidity was
not reported and thus was assumed to be 0.7.