MHD Mode Composition in the Inner Heliosphere from the Parker Solar Probe's First Perihelion - Chaston, CC; Bonnell, JW; Bale, SD; Kasper, JC; Pulupa, M; de, Wit TD; Bowen, TA; Larson, DE; Whittlesey, PL; Wygant, JR; Salem, CS; MacDowall, RJ; et al. (ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2020)