A new LCIO-based data format called mini-DST has been developed, which combines Particle Flow Object (PFO) and event-level information, including the output of the most important high-level reconstruction algorithms. Originally triggered by Snowmass 2021 studies, the mini-DST is useful for beginners as a starting point of an analysis. In this note, we discuss the basics and contents of the mini-DST, how to create the mini-DST file from fully simulated MC samples, and the limitations of mini-DST.
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