You will find reference start files online here:
- reference start_archives from MCDv6.1 simulations: https://web.lmd.jussieu.fr/~lmdz/planets/mars/starts/
- reference start_archives from MCDv5.3 simulations: https://web.lmd.jussieu.fr/~lmdz/planets/mars/starts_MCDv5.3/

The file "start1D.txt" is specific to the 1D model. An example is provided alongside this README. It is consistent with 8 atmospheric layers and with 5 tracers listed in that order [co2, h2o_ice, h2o_vap, dust_number, dust_mass] in "traceur.def". More information at https://lmdz-forge.lmd.jussieu.fr/mediawiki/Planets/index.php/Mars_1D_testphys1d_program.