This is BibTeX, Version 0.99d (TeX Live 2020/Debian) Capacity: max_strings=200000, hash_size=200000, hash_prime=170003 The top-level auxiliary file: preprint.aux The style file: iopart-num.bst Database file #1: biblio-cluster.bib Reallocated wiz_functions (elt_size=4) to 6000 items from 3000. You've used 23 entries, 3033 wiz_defined-function locations, 793 strings with 8912 characters, and the built_in function-call counts, 23382 in all, are: = -- 2708 > -- 325 < -- 5 + -- 160 - -- 121 * -- 1622 := -- 2544 add.period$ -- 0 call.type$ -- 23 change.case$ -- 7 chr.to.int$ -- 9 cite$ -- 23 duplicate$ -- 2101 empty$ -- 2238 format.name$ -- 107 if$ -- 5410 int.to.chr$ -- 0 int.to.str$ -- 23 missing$ -- 276 newline$ -- 79 num.names$ -- 24 pop$ -- 529 preamble$ -- 1 purify$ -- 0 quote$ -- 0 skip$ -- 221 stack$ -- 0 substring$ -- 3735 swap$ -- 586 text.length$ -- 2 text.prefix$ -- 0 top$ -- 0 type$ -- 0 warning$ -- 0 while$ -- 275 width$ -- 25 write$ -- 203