detail.pdf is the manual produced by Keith Butler.

Some instructions for running DETAIL.
- directory detail_f90 includes the source files; detail2022 is an executable produced by Intel fortran for Linux (Fedora);
- for each NLTE element, the working directory has 
  to include input files: model atom, photoionization cross-sections, collisional data;
  to link to BACK.PIC, hminus.dat, highlines.dat, lowlines.dat, nltelines.dat: ln -sf path to the directory, where they are located; 
- ../detail_f90/detail2022 < input(model atom) > output
  
Output files: output, fort.29, POPS

In order to produce *.pop for synthV_NLTE, use depsiu_butler.f and depsiu_many.inp.