Molecular composition of haze samples from the N₂-rich/CH₄ and H₂O-rich/CH₄ experiments. Left panels: very high-resolution mass spectra (m/z 150–800) of haze particles produced from the N₂-rich/CH₄ and H₂O-rich/CH₄ experiments, acquired in both positive and negative ionization modes. Assigned CHO, CHN, and CHON species are shown in red, green, and yellow, respectively, while the gray data points correspond to mass peaks with no formula matched within the mass accuracy threshold (<0.0001 Da). For each spectrum, the adjacent pie charts summarize the percentage of molecular formulas and their relative abundances based on the summed peak intensities of the assigned organic species. Right panels: corresponding van Krevelen diagrams combining matched formulas from both ionization modes, shown as H/C vs. N/C and H/C vs. O/C. Each circle represents an assigned formula, where color denotes the degree of unsaturation and marker size scales with peak intensity.