Electron velocity distribution function (VDF) measured at 12:40:20 UT on 31 Jan 2020 by the SWEAP experiment on PSP. Toppanels: orthographic projections of the VDF at 314 eV (with blocked and/or contaminated pixels removed), in the solar wind proton frame. Symbols indicate electron velocities parallel (blue) and antiparallel (red) to the sunward magnetic field (diamonds) and the antisunward proton velocity (pluses). Center panel: 2-d projection of the same electron VDF, in magnetic-field aligned coordinates. Bottom panel: difference between the measured VDF and a drifting bi-Maxwellian fit to the electron core.