This is a NASA NICER observation of the accreting black hole MAXI 1820+070 during its 2018 outburst The raw X-ray event data in FITS format were obtained from the NICER archive at HEASARC: https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3hdprods.pl?files=Preview&Coordinates=Equatorial&Equinox=2000&CheckSize=1&showgifs=1&Target=heasarc%5Fnicermastr%7C%7C%7C%5F%5Frow%3D30877%7C%7C&popupFrom=&querytime=1708425079 Processing: We ran the barycorr FTOOL, using the JPL DE 430 ephemeris (all details of processing can be found in the header of the FITS file). We distribute it to be used as practice data for Spectral Timing tutorials. Scientific use might require better processing, involving a re-run of the Level-2 data pipeline.The data come in three versions: the original ~2.4GB FITS file a reduced ~720MB HDF5 file containing only part of the data, to help with slow connections a further reduced ~370MB HDF5 file, containing even less data but still adequate for most purposes in the tutorial.