Proton Temperature Anisotropy Variations in Inner Heliosphere Estimated with the First Parker Solar Probe Observations - Huang, J; Kasper, JC; Vech, D; Klein, KG; Stevens, M; Martinovic, MM; Alterman, BL; Durovcova, T; Paulson, K; Maruca, BA; Qudsi, RA; Case, AW; et al. (ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2020)