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Table E.1.

Configuration of TARDIS simulations used to fit the measured spectra with the synthesized spectra.

Constant parameters of TARDIS simulations
Atomic physics database: Monte-Carlo settings:
atom_data: kurucz_cd23_chianti_H_He.h5 montecarlo:

Model settings: seed: 10000000
model: no_of_packets: 50000
 structure: iterations: 20
  type: file last_no_of_packets: 150000
  filename: density.dat no_of_virtual_packets: 4
  filetype: simple_ascii  convergence_strategy:
 abundances:   type: damped
  type: file   damping_constant: 1.0
  filename: abundance.dat   threshold: 0.05
  filetype: custom_composition   fraction: 0.8

Plasma configuration:   hold_iterations: 3
plasma:   t_inner_update_exponent: -0.5
ionization: nebular   t_inner:
excitation: dilute-lte   damping_constant: 1.0
radiative_rates_type: dilute-blackbody    threshold: 0.05
line_interaction_type: macroatom   t_rad:
disable_electron_scattering: False    damping_constant: 1.0
disable_line_scattering: False    threshold: 0.05
 nlte:   w:
  species: []    damping_constant: 1.0
  coronal_approximation: False    threshold: 0.05

  classical_nebular: False Spectrum settings:
 continuum_interaction: spectrum:
  species: [] start: 1700 angstrom
  enable_adiabatic_cooling: False stop: 10000 angstrom
  enable_two_photon_decay: False num: 600
helium_treatment: none
link_t_rad_t_electron: 0.9

Notes. From top to bottom, the blocks are as follows: 1) The database used for atomic and statistical physics calculations. 2) The TARDIS model settings: the density and abundance profile are taken from an external data file, enabling their cell-by-cell definition. It is important to note that while the data in this table remains constant, the actual content of the mentioned files, i.e., the density and abundance profile, serves as fitting parameters in the simulations. The details are discussed in Section 5. 3) Settings related to plasma calculations 4) Parameters for Monte Carlo iterations and the update of various physical quantities per iteration. The quantities indexed with ’inner’ refer to the photosphere. 5) The last block contains settings related to the synthesized spectrum.

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