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tmp_bt is a large array initialised in the current develop branch and only a small number of its entries are used. When we skip initialisation and only define the entries that are needed for the program to run, the total memory usage of ndlar_flow goes from 4.7 GB to 4.0 GB. The outputs are identical, as determined by MD5sum. Memray flamegraphs for the programs run before and after the change can be seen below.