Simulation snapshots of density fluctuations at t = 70 min as the CME propagates through the solar wind. Panel a depicts the case from S23 where no compressible fluctuations exist, and panel b depicts the solar wind from the present study containing both Alfvénic and compressible fluctuations. Panel b is annotated with the viewing angles corresponding to the CME flank (160°) and head-on (125°).