Core electron temperature T_c,e (in eV) scaled to 35.6 R_⊙, provided by the plasma QTN spectrum measured by RFS/FIELDS, against plasma speed (km s⁻¹), provided by SWEAP/SPC. Left column: data for calm solar wind intervals only, for the entire data set (top) in state 1 (middle, red-to-black colors) in state 2 (bottom, blue-to-black colors). Right panel: same organization but for rest of the data set. Colors indicate the probability distribution function for the points.