data frame containing the results from the curve analysis only, depending on the function used, relative water deficit at
turgor loss point (rwd.tlp), water potential at turgor loss point (water.pot.tlp), apoplastic fraction (apo.fract),
osmotic potential at full saturation (osmotic.pot.full.sat), modulus of elasticity (modulus.elasticity),
time since start of desiccation of stomatal closure (stom.clos.time), relative water deficit at stomatal closure
(stom.clos.rwd), minimum conductance determined by the intercept of the leaf drying curve fit with the point of stomatal closure
(stom.clos.gmin), by taking the mean from all minimum conductance values
(mean.gmin) or minimum conductance determined by extrapolation of minimum conductance curve linearly to full
saturation (gmin.full.sat)