Jmax-related temperature response parameters from Bernacchi et al.
jmax_temperature_param_flat.RdParameters that describe a flat temperature response (in other words,
  no dependence on temperature) for Jmax-related photosynthetic
  parameters, intended to be passed to the
  calculate_temperature_response function.
Format
List with 2 named elements that each represent a variable whose temperature-dependent value can be calculated using a polynomial equation:
alpha_j_norm: The apparent quantum efficiency of electron transport (alpha_j) normalized to its value at 25 degrees C.theta_j_norm: The empirical curvature parameter normalized to its value at 25 degrees C.
In turn, each of these elements is a list with 3 named elements:
type: the type of temperature response.coef: the polynomial coefficients.units: the units of the corresponding variable.