Anticorrelation between the Bulk Speed and the Electron Temperature in the Pristine Solar Wind: First Results from the Parker Solar Probe and Comparison with Helios - Maksimovic, M; Bale, SD; Bercic, L; Bonnell, JW; Case, AW; de, Wit TD; Goetz, K; Halekas, JS; Harvey, PR; Issautier, K; Kasper, JC; Korreck, KE; et al. (ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2020)