1. Figure_1_original_absorption_intensity_strength_from_HITRAN.csv contains the orginal data downloaded from HITRAN database

In the first line are absorption central wavelengths in the 1.5 micronmeter spectral region, in unit of cm^-1;

In the second line are corresponding absorption line intensities, in unit of cm^–1/(molecule/cm^2)

2. The program to simulate the 1 meter transmission in acetylene gas of 1 mbar is included in the MATLAB script file theoretic_absorption.m.

Data of Figure_1_original_absorption_intensity_strength_from_HITRAN.csv is added in data_lines.mat file for the MATLAB script to import. In data_lines.mat, the wavelength is converted and in unit of nm.

To calculate the theoretic absorption, the linewidth function is decided by the Doppler broadening only.