=== SLED_fitting_NGC6240_220328.ipynb ===

The origin fitting with two components gas.

=== SLED_NGC6240_dense_only_220402.ipynb ===

Constrain dense molecular gas component by HCN, HCO+, and cold dust component, using gas to dust ratio 100.

=== SLED_fitting_NGC6240_3comp_220404.ipynb ===

Fitting with abundance/Kvir ratio due to the degeneracy in HCN, HCO+, and CO fitting. Dust continuum can break this degeneracy.

=== SLED_fitting_NGC6240_3comp_Ncol_220406.ipynb ===

The fitting without dust, which shows degeneracy in abundance and H2 column density.

=== SLED_fitting_NGC6240_3comp_dust_220408.ipynb ===

Add two components dust. Cold dust temperature and mass are according to cold and dense gas component. Warm dust temperature is an independent variable， and dust mass is according to the sum of two warm gas components.

=== SLED_fitting_NGC6240_3comp_allmol_220410.ipynb ===

Add 13CO, CS SLEDs into fitting, using cold component dust.